Why funny you should ask, lou...
Hey, I resemble that remark, Mr. H.!!
I do believe the A-Man 5 cover is by Everett. The 6 cover is very captivating IMHO, and is one of my favorites.
I'm obviously a huge Centaur fan, and I think A-Man 5 is a great book (wish I owned one) - even more desirable than the AMF 1 - but I'd simply rather put that kind of big money elsewhere...and you're talking to the guy who used to own the Church run of A-Man 6 thru 11 (I still have the 6, 10, and 11. FYI, the 7 was color touched on the spine).
STEVE