Hey man, I'd like to clarify a couple of things. You're right that the iq2 would not suffer lobing, but the iq6 still does. It is flanked by bass drivers. You can't just say (as you have been recently) that there is NO lobing. You might* say that this lobing will only occur with frequencies that are low enough where we might not care, but we wouldn't know without knowledge of xover point, and distance between the two drivers. But, you definitely can't just that there is NO lobing. And while the iq2 doesn't suffer lobing, one might consider power handling limitations, especially because it is the center speaker.
And I am in the boat of matching the speakers. Definitely. I wasn't always, and trust me, I'd love a fantastic center speaker just like everyone else, but it's just not that simple.