Couple of things here, zn.
First of all, we are in complete agreement that RT is among, if not the least difficult positions on OL to find and replace. I never said otherwise.
But that wasn’t my point. My point was that Hav is a top RT by any measure, young, healthy, and very affordable for at least the 2-3 years before Goff’s extension.
As such, it makes a TON of sense to me to have given him his extension. Heck, it seems brilliant, based upon the year he had. BTW, I don’t understand his pass blocking ranking that you refer to. Not denying that the ranking exists, just saying that I question it. Not unlike my questioning PFF’s #16 ranking for Gurley as a RB? When I watch Hav, he looks just fine and he very rarely gets a flag.
As to Saffold? Here again we are in agreement. He would be a solid extension, IMO.