Depends on your current ninjas. Mostly roshi is a replacement for a tank in immortal teams (like the water or earth main one), so, if you play a different kind of lineup you could think to skip it or wait a while to see how the things go on. The 2nd half of jinchuriki have han as superrare that is a prompt round1 buffs/shields remover (also your ones) while roshi is a prompt round2 tendo that have the same passives as naruto ninetails chakra 2 star + a not bad 30 combo chase. Common rares in both of the treasures are soso or better say they aren't better than current ones (yagura is more or less a water version of sage naruto, etc... )