Alright...I know that Yoshimo will leave your group...but can someone tell me when this happens?

Also...has anyone tried removing him from the party before this and picking him up after the scene ends? Just an idea, though I'm obviously that far in yet.

Mustaine

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Yoshimo is one of Irenicus' henchmen. He'll show his true identity once in the Asylum. I've not tried leaving him behind so maybe that's a way to bypass it all. But I doubt it.

I haven't had him in my group, and he didn't show up in the battle at spellhold. I haven't checked the Coro since then, but I guess he'll be around there. I wouldn't take this bastard in my group, though, he betrayed you once, you could never trust him.

It's actually pretty funny (or sad for me, I actually liked Yoshimo); you walk into the Copper Coronet after Spellhold, and Yoshi just drops dead right there and then. : P

If you pause as soon as you enter the Coronet and initiate conversation with Yoshimo, he will rejoin your party and then die. You can then have him resurrected at a temple and carry on with him.

Wow!
Unfortunately that means not taking him through chapters four and five, but still, wow! Never thought of that.