Yes, absolutely he's designed around that. Ideally you should be trying to get a specific form, and the enemy team should be able to guess what form you're going for and predict your pathing accordingly. Not perfectly, mind you, but at the level of small hints and guesses.
This was the first thing we designed for Kayn. It was this core loop (transform permanently into one of two very different forms; you have to interact with the enemy to get those forms; and the enemy can predict to some degree what you'll do) that convinced us to make Kayn.
So I think completely avoiding fights is wrong. There's a reason you can still pick the other form after a 3 minute delay; we never want you to be screwed to the point where you can't contribute. Also, consider this: taking good fights early that push you toward the wrong form may still get you your desired form EARLIER if the other option would have been to wait more than 3 minutes for the correct fights.