Yea, I am not an expert on Alonso, but it looks like the Reds traded him at his peak value.
Career OPS at home 759
Career OPS away 752
Most of his career has been in SD, and he actually hits better at home, so it's hard to blame Petco.
I know he said he redid his swing because of Petco, but a 1b that only OPSes 760 or so is not incredibly valuable. Maybe in time, he'll improve, but I'm glad we didn't move Votto to LF to make a spot for him