I earned Kanan Jarrus as an ally in my Jabba's Realm LOTA campaign. Would the Force Vision ability be ignored as there is no Imperial player to make the choice?

You would expect so.

So, not the best ally to be randomly given I guess.

He still has Soresu Defense , and the Health/Cost ratio is very good.

If you tap an imperial group in the app before ending his activation, you have the option to activate them by if you tap the i. Then once all the imperial groups have activated end Kanans activation. It is a little messy, but it does allow you to use Force Vision.

Then you would take onto yourself also the order the other imperial groups activate, allowing you to "cheat" or make it harder. You would also have heroes activated but not marked as activated in the app. Because some targeting uses ready/non-ready, it will be easy to make mistakes. Events will make it easy to mess the whole thing up as well.

I don't think keeping track of it all is worth it.

That's a good point. I hadn't considered how it would interact with events.

You could just end Kanan's activation in the app to get the app to show you which group it's going to choose to activate next, and then finish activating Kanan on the table.