I don't know what your team looks like so it's hard to say... But if you are more concerned with RB then go with Buck.. Landry should be a PPR machine. He has great hands etc etc but the new system does make me worry a little - Allen was probably used so much due to a massive lead.. But even if this becomes a time share you still cant trust him every week.. I'd stick with Landry but Brendan really likes Buck a lot more than me https://fantasyknuckleheads.com/week-2-waiver-wire-picks-running-back-2/
Id keep your team as is.. looks great.. you could try a package trade of your lower tier WR/RB combo to make a upgrade. Probably some folks panicking after all the week 1 injuries.
I was thinking about that but not sure who. I was also thinking I have too many options at starting line up this week. Cobb or Olsen? I start Tate so probably not Golladay Same with Baldwin and Lockett