What if Tigerclaw was never born, or died as a kit with his siblings?
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1: If Leopardfoot and Pinestar never had kits and Tigerkit was never born, Pinestar would still have left to become a kittypet. Having kits didn't influence his decision. If Tigerkit had died with Mistkit and Nightkit, Pinestar definitely still would have left. He claimed that Clan life was too hard, and losing all three of his kits would have made him feel stronger about this.

2: Tigerpaw would not be Thistleclaw's apprentice, so Tiny would never be attacked and leave his home to live in the city.

3: Redtail would not have been killed, Ravenpaw would stay in ThunderClan, and Darkstripe and Longtail might not have been such bad cats because of Tigerclaw's influence.

4: If Longtail doesn't have Tigerclaw to look up to, he might not pick a fight with Rusty when he first joined the Clan, so Longtail doesn't have a split ear.

5: Because Ravenpaw never leaves ThunderClan, he never becomes friends with Barley.

6: Tigerclaw isn't there to plan a trap for Bluestar, so Cinderpelt's accident never happens, and she becomes a Warrior.

7: Redtail would still be alive, so Fireheart would never be Bluestar's deputy unless something happened to him. Assuming that Redtail doesn't die, he would live to become Redstar. His deputy may or may not be Fireheart.

8: Goldenflower would have a different mate, or no mate at all, and Brambleclaw and Tawnypelt are never born.

9: The dogs are never brought to the forest, so Brindleface, Runningwind, Swiftpaw, and Bluestar never die. Bluestar lives longer than she did.

10: Because Fireheart has no reason to speak with Graypool about Oakheart's death, he never finds out that Mistyfoot and Stonefur were Bluestar's kits.

11: Because Tigerclaw wasn't there to lead Brokenstar's former Warriors, they remain rogues until they hear of sickness in ShadowClan. Having no cat to lead them, Blackfoot becomes leader.

12: Gorsepaw, Morningflower's kit, lives to become a Warrior.

13: RiverClan and ShadowClan never unite to become TigerClan, and because BloodClan is never created, the battle with BloodClan never happens, and Whitestorm, Darkstripe, Tiny, Bone, and many others don't die.

14: Because Darkstripe's attitude is different, he never feeds Sorrelkit deathberries, and is never exiled from ThunderClan.

15: Because Swiftpaw never dies, he and Brightheart likely become mates, and Whitewing is never born, therefore Dovewing and Ivypool are never born.

16: Sasha never has kits with Tigerstar. Hawkfrost, Mothwing, and Tadpole are never born.

17: Stonefur is never killed, so he likely succeeds Leopardstar instead of Mistyfoot.

18: Because Brambleclaw and Tawnypelt are never born, the chosen cats from ThunderClan and ShadowClan to journey to the Sun-Drown Place are different.

19: Brambleclaw never exists, so Squirrelflight becomes mates with Ashfur.

20: Hawkfrost isn't there to trick Stormfur into attacking him, so Stormfur and Brook stay in RiverClan.

21: Jayfeather, Lionblaze, and Hollyleaf are still born, however, their foster father is Ashfur, not Brambleclaw.

22: Tigerheart, Dawnpelt, and Flametail are never born.

23: Because Ashfur is Squirrelflight's mate, there is no cat to reveal the secret, so the three never learn that Leafpool and Crowfeather are their parents. Hollyleaf never runs away to the tunnels.

24: The Dark Forest's leader would likely be Brokenstar, and unless a different cat is born to replace Dovewing, they win the battle because the Clans don't know about the attack because they don't have her powers, and Ivypool never exists to spy.

Now, lets take a minute and look at the current Clans.

-ThunderClan-
Leader: Redstar (Or whoever his deputy was)
Deputy: ???
Medicine cat: Leafpool, Jayfeather
Warriors (Assuming all are alive): Fireheart, Brackenfur, Cinderpelt, Squirrelflight, Cloudtail, Brightheart, Swift???, Thornclaw, Birchfall, Berrynose, Mousewhisker, Poppyfrost, Cinderheart, Lionblaze, Rosepetal, Briarlight, Blossomfall, Bumblestripe, Cherryfall, Molewhisker, Hollytuft, Fernsong, Sorrelstripe, Darkstripe, Runningwind
Queens: Daisy, Lilyheart
Elders: Purdy, Graystripe, Sandstorm, Millie, Brindleface, Whitestorm

ShadowClan and WindClan haven't changed much, so I'll skip them...

-RiverClan-
Leader: Stonestar
Deputy: ???
Medicine cat: ???
Warriors: Stormfur, Brook, Mistyfoot (The rest are insignificant)