I would definitely do this. Gore is money in a ppr league. Although you are giving up Gates, the addition of two starting RBs in Gore and McCoy will make up for it. Also, Shiancoe is a serviceable TE. I have him in my 0.5 ppr league and for his draft position, he has been holding his own. You will also be upgrading your WR starter from Maclin who is a true WR2 on his team to Megatron who is a true WR1.
I may take part in a 4 team trade where I would give up: C. Portis, S. Greene, D. McFadden, A. Gates
I will receive: L. McCoy, F. Gore, Calvin Johsnon, V. Shianoe
This should of been insta accepted.
You upgrade your rbs HUGEly. You get gore, a top 5 pick who is probably the best player in this deal, c. johnson probably the 2nd best player who is a wr1. And you get mccoy who seems to be having a breakout year and you downgrade your te but shianoe isn't terrible.
12 Team League. We start 2 QBs and get .5 PPR, otherwise standard scoring QBs: Stafford, Fitzpatrick, Collins RBs: Charles, Mendenhall, Best, Starks, Carter, Karim WRs: D. Jackson, Marshall, S. Smith, Green, TE: Hernandez, Cook