TRADE ON a 12 team ppr league FEEDBACK PLEASE

So i got Demarcus Robinson and Chris Thompson on waivers and I traded both for David Montgamory. Was this a good move?

Now my RBs are Dalvin Cook, Kerryon Johnson, Mongtamory, and Singletary

I was thinking of getting Penny or Gallman on the waiver but the trade doesn’t go through until wednesday or thursday i think. So I was thinking of getting CJ Anderson on the free agents because I think the giants will sign him