I agree and had the same feeling when I saw our line-up was also happy to see Diaby back and strong particulalry late in the game although he lacks a bit of sharpness.
I don't think Henry is our weakest link in terms of skill but when he is on the pitch other players seem more reluctant to run plays that do not involve him making us a bit more predictable. In other words we appear more like a team with many "threats" (if that's what you want to still call it after last nights poor finnishing) rather than mainly one.
I think we need an other big name player next to Henry who has the selfishness and confidence that comes with big name players (maybe Eto could fit that although I am not a fan).
Van Persie has a bit of that big name player attitude and selfishness and maybe that explains some of his relative success in scoring this season, he does not seem intimidated by Henry or to put him on a peddestool (? sorry for poor spelling), I think Adebayor would pollish Henry's shoes if asked...