Neither was Sol. And also it's been confirmed Brambleclaw is blinded in The Forgotten Warrior so therefor he won't become Brambleclaw. See this for more:
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OK, this is what I know about The Forgotten Warrior:
1. It will be revealed whether Hollyleaf is alive or not. Though she probably is.
2. Brambleclaw gets attacked and goes blind.
3. Firestar dies... I think. So there will be a new leader that ISN'T Brambleclaw.
4. The Forgotten and the Fourth are the same cat.
Noooo! Bramblestar! I've always wanted Bramblestar! Agh! (I think it's gonna be Lionstar, just saying)
Brambleclaw goes blind?! AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Yes, Lionstar would totally rock. What if, before he died, but after Brambleclaw went blind, Firestar lost his mind and appointed Briarlight? 
Poor Briarlight...
A leader is meant to show loyalty and courage to the Clan. Lionblaze can't be beaten in battle and with nine lives... that's not courage.I think it will be Cinderheart, Sorreltail, Whitewing, Birchfall or Hazeltail.
Which Erin said that about Hollyleaf and Sol?
No, I think it will be Thornclaw, he's been around longer than Brambleclaw.
That's sad I think I was gonna like bramble star, but lionstar could be good. But it might be a more senior experienced warrior than lion blaze, maybe cloud tail, but lion blaze is good choice, I think the fourth is ivy pool cause she always said people always forgot about her cause dove wing was so special.
OMG! NOT FIRESTAR! 
Well, i guess its his time.He should really move to the elder's den, not die in the Dark Forest fight. (not saying that he will!)