My only argument to replace AP with Gurley is that AP was drafted 2007. Ya he's still playing but was injured & suspended so much during the mid 2010's that I kinda don't think he qualifies.
Honestly, in '15, '17 and '18 when TGII was all-pro, would you rather have him on your team or AP??
AP was such a beast in his prime, but 1st half 2010's AP vs. 2nd half 2010's TGII, who ya got?? I'd rather roll w/ Gurley tbh.