yes, it's overkill.
i edc 2 knives and i think that's already plenty. i got a strider DB as my thick, hard use knife and a strider sng for lighter, finer, general use. i can't imagine why anyone would carry more, or if it'd be at all
useful. now, if the guy is seriously a collector and just happens to like having a bunch of nice knives in his pocket, that's his prerogative. and i'm willing to bet a couple things:
A) he actually only uses 1 out of the 4
B) he likes knives for being
knives, not b/c they are useful. it'd be like carrying around art that you could admire all the time.
that, or i could see carrying around 4 knives b/c they are 4 crappy knives and he doesn't expect them to last. but i spend good money on good knives with good warranties, so 2 will suffice for me.
but hey, that's what freedom is. he (and you) should carry
as many knives as you damn well please. end of story.