In your case, theres no 'overall performance' to lose sleep over. You have a separate driver for each range going 3way.
Is the Kickbass driver capable of very nice midrange? yes...
But I believe a few bands of eq on hand could be needed. Reason? The lower frequencies boosted by cabin, reflections and door panel resonance can 'mask' your midrange. This stands true for any speaker. But because its a good efficiency, high Qts driver that will give you great performance in that range a good install/tuning is necessary to gets its very best overall performance.
The speaker is designed not as a dedicated midbass, but as a wide range driver. From my experience it has nice midrange. Very few drivers can excel wide range in the whole spectrum. Those that have nice midbass can yield poor midrange or not play high enough, those with colorful midrange can have less than stellar midbass. The kickbass drivers are designed to give you that upper range without sacrificing the midbass performance. As a dedicated midbass IMO is as good as it gets for 6.5" driver- good efficiency, high Qtc, good powerhandling..