I would never think of Infinite Fire as your "typical Neal Morse epic" or anything like that. For one, the song is built around Steve Morse's recurring motif, the likes of which you never hear in a song on a Neal Morse solo album, and for two, Casey's lead vocals give it a very different feel. Same thing, regarding the latter, with Cosmic Symphony, where the 2nd part sounds Neal-ish, in large part because he sings it, but the first and third parts don't sound Neal-ish really at all.
Personally, I like both of those songs a lot cause, aside from just being really good tunes, they are in that 10-12 minute window, which is the perfect length for a great proggy song. It's long enough to have that epic feel, but not too long to where it feels like work to get through it (which is a problem with some of Neal's 20-minute plus tunes).