I think you made the right choice. SD has nothing at RB and Gordon is an elite feature back.
Sarge is righr, they need a RT to push fluke inside...but I saw higher value here at RB... I also thought about a WR to pair with Allen...but I felt franchise RB was most bang for your buck. I think Gordon, Gurkey, and maybe even Duke Johnson would be gone by their next pick (and I feel there is a big drop off after those 3). I don't think you can take Gurley this high with the risk he won't be ready for week 1. Could HYATT be right and he's another Matthews? Maybe. But they need to come out of this draft with a #1 RB...even if he is only ready for 15 carries and 4 balls out of the backfield a game...they don't even have that guy on their roster today.