I'd say go for your SR in GNW Treasure. Roshi only shines at 100K+ BP. 90K below, he gets blitz and dies at round 1-2. By the time you get your SR in GNW Treasure, you will already have plenty of free draws from Jin 1 treasure which will cost you less SS to pull Roshi.

I would say not enough. He still gets blitz down even at 95K on par power with MB blitz team (MB, Iruka, Darui, Asuma WB).

The reason I mentioned 100K is because at that BP range, you most likely will have the stats needed for Roshi to be alive from Blitz teams. I'm at 95K with HP mood at 65% and Roshi is standing in an HP tile (lvl5 Ghost Kill) and he now lives to tell the tale from equal BP Blitz team. When I was still at 75K even with 65% HP mood and lvl5 Ghost Kill tactics on HP tile, he still died from equal power Blitz teams because during that time, I did not have the stats needed for him to be alive (lvl4 mags only). Now I have lvl6 mags and he now survives.