So Ayla chose Kino because he'd be the only man willing to listen to her advice or "let" her still have power
Yeah. There was a word for that, but I can't seem to remember -- something about King being "just for show", while the person pulling the strings is someone else. However...
That's an interesting possibility (if a disappointing one), but wouldn't it be more likely that she chose him because she likes him and because he's one of the strongest in Ioka?
That's just my thought; I know of no canonical answer.
XD You guys are pushing logic through sheer physical strength here, in which case Kino would already be a dud, wimp and loser. There's obviously more to the character than brute strength.
Think about it for a second: Ayla might be the strongest which gives her privilege to be the tribe leader, and the successor could be anyone
but Kino in this regard. However, Kino didn't depend on physical strength. When even the smartest of Reptites or toughest of cavemen challenged you to a straightforward battle, Kino would get cunning and make you chase through the woods, playing games with you. He always stays cautious, observing your movements, treading carefully, staying focused and snatching things that you most need. Also, he is relentless and agile.
Ayla was wise in her decision. A strong man who is nothing
but a strong man makes no leader, and eventually shove his people to extinction; a true leader needs to take tough, cunning decisions to secure his people, and Kino was the best for the job.