Tobi needed to be fixed to a certain degree. With the addition of Danzo he became even more broken compared to other available ninja's. Izanagi allowed for a reset on his revive. So yeah the Unyielding passive had to go. But I see no reason to remove the Knockdown from his mystery especially now that Genjutsu Mirrior Return from Scarlet Blaze no longer boosts the damage while being under ignite status.

As for Tendo the only real issue I have is with his mystery now costing a whopping 80 Chakra. It makes him basicly only good in Ranked and GNW battles. Sure you c*e it in round one if you pair him with say 10 Puppet Chiyo but that doesn't make any sense character fluff wise and really cripples his usefullness alltogether. If other Pain ninja's would have a passive along the lines of lowering his chakra cost then it would make allot more sense imo.