It's higher than I would have liked as well, but I don't think it's comparable to the Kesler deal at all. The Kesler signing was Murray being Murray and rushing something because he doesn't like potential UFA's "hanging over his head". He rushed that one, and it cost him. I don't think there was much risk at all of Kesler playing more that following year and increasing his value (whereas Henrique, I do see that potential). Kesler's deal also didn't start until he was 32 (Rico's starts when he's 29), and Kesler had a lot more "mileage" on him than Rico because of the way Kesler plays. Hindsight is 20/20 but thinking back about it, the Kesler signing was much worse than most realized when it happened. At the time, I didn't hate it, but I did mention I thought Murray rushed it, and it definitely hurt him/us.
Fowler's deal is a little more similar, but I understand Murray's logic on that one. Cam had taken a step that year and I think Murray expected he'd at least perform at that level again. Instead he regressed last year, which is obviously unfortunate for us all. I don't think Cam's deal is bad though. I think he's still a #2 and 6.5 for those isn't bad at all IMO.
As for my thoughts on the Rico signing: I was expecting 5.5 for 6 years because quite simply, centers get paid. Ideally this would have been lower, but this is pretty much spot on with Murray and UFAs though. Most of the time they're thought of as "high, but not awful". Exactly where I'd label this one.