I most definitely can. I want to assume that it should be strong because it's damage is altered by minion capacity but we'll see. I'll make one soon and start going through phm and go into hm. I don't mind flip-flopping multiple characters for the sake of mod feedback, which by the way, I'm totally digging Ninja so far!
Edit: Like I said, the only reason why I'm a little worried is because summoning is powerful due to it's mobbing capabilities. Feedback is on its way!
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If anything, don't make it instant, make it at least a 15 second cooldown, that way there's at least 5 seconds of downtime, you know? From first glance I would say a 15/20 second cooldown wouldn't be too overpowered.
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So, if I'm understanding this, sentries aren't getting a damage bonus? That's disappointing. I feel like it's already going to be pretty challenging with one minion. The sentry would probably allow you to go pure summoner with little issues. Again, this is just speculation. I'm gonna go ahead and whip that character up now.
Edit: Maybe you could calculate it so that sentries could get half of the bonus or something? That way they don't feel left out. I could also be misunderstanding your post and the sentries could be super strong, if so, I'll correct my post or delete some things, haha.