Sorry if someone has posted this but, I was just thinking about the StarSeeker Keyblade and how Mickey uses it in BBS while he is training under Master Yen Sid, so I thought maybe the StarSeeker IS Yen Sid's keyblade. Since he lets Mickey and Sora use it. Plus it does look like "Mysterious Tower's" World Based Keyblade

Well, uh, yeah, that's his Keyblade. The one he leant to Mickey in BBS anyways. Judging by the way TAV's wayfinders turned into the keychain for Star Seeker in the BBS intro, I think it's safe to say that they're created through bonds, or at the very least, represent them. For Sora, he created a bond with Yen Sid, and like all of the other people he met, a keychain was created. Or given. Doesn't really matter. Regarding the last bit of your post, Sora doesn't have Yen Sid's Keyblade.

The Star Seeker is the keyblade that Yen Sid lent to Mickey

Yes i believe it is Yen Sid's keyblade because in 358/2 days mickey has da gold keyblade,and he gets that later after bbs.

Btw wat i meant by gets that later after bbs i meant the gold keyblade.

yeah its yen sid's

Really guys if you vome to yhink about it it looks a bit crapy and yeird for yen cid to have a keyblade and here's another question why would he cast it aside

Really guys if you vome to yhink about it it looks a bit crapy and yeird for yen cid to have a keyblade

1. He's admitted himself that he's a Keyblade Master.

2. He used to be friends with Eraqus and Xehanort, as a fellow wielder.

3. The Star Seeker matches with his outfit.

4. Sora obtained the Star Seeker keychain after meeting Yen Sid.

5. Mickey returns the Star Seeker in the final ending for BBS.

 

Need any more hints?

 

and here's another question why would he cast it aside

 

He. Is. Retired.

 

Say it with me.

 

Retired.