It can, actually. Blaziken just uses HJK.Not at all. Infernape's dual 120 BP special STAB, with excellent coverage and the ability to OHKO Blissey after a single turn of setup is something that is very difficult to stop outside of Infernape's frailty, and can never be usurped by Blaziken.
I'd like to see a list of things that Infernape can reliably KO with the NP set that Blaziken can't, and I mean absolutely can't. Things like Jellicent that Blaze can KO with a decent coverage move don't count.
What other special walls, per se? I can't particularly think of any at the moment - Jellicent is immune, Latias resists it (and is faster), Milotic will take more from GK, Ferrothorn is roasted by Fire Blast...I'd rather go for the KO on Vaporeon, but I guess both are equally viable. If I were to use Infernape in the first place.NPApe can still carry CC for Blissey and other special walls. Fire Blast and HP Ice gets pretty good coverage with CC I think.