If you want to pick the top 3 total points scorers for 2RF this year
Tolo is a clear favourite. I'd probably put JTrbo in 2nd spot, and 3rd place Matterson is as good a shout as any (Arrow, Murray would be contenders, maybe Nathan Brown as an outside shot)
If you can bring in a keeper level player, in any position, without killing the rest of your team to do so, then you should do it.
If you already have, or can't afford Taumalolo, Matterson is a good shout for keeper 2RF to bring in.