Yeah, you got it - Cobham seemed like the odd man out, to me.
Stanley can certainly do this. On a good day - on upright - he can make my top ten list (electrics rarely make it in there, though I always waver a bit on Jaco, just because he was so unique). But I'd be a little nervous that together, Cobham and Clarke could pull Tyner off-center.
Last time I saw Tyner, Avery Sharpe was on bass (forget who was drumming), and he was great. Mostly upright, but he did a few songs on electric (don't remember what kind), and fit in tastefully.
I haven't really followed Cobham, and I guess the fact that (as far as I know) I only have him on one recording says something about my personal tastes. Spectrum was a decent album, and there are a few tracks on there that I still enjoy, but I've tended to think of him as a power/fusion player, and I seem to favor a more musical approach, ala DeJohnette.
Of course, given that we've recently lost Elvin Jones and Tony Williams (not sure if Williams and Tyner ever played together, though it seems nearly certain), maybe pickings are slim.
If Cobham has tempered, as you suggest, can you recommend any recordings?
-Bob