I think you misinterpret what Yoda said, Rob. The way Ahsoka said it did not sound like Yoda's line from ESB. The writers may have went that direction of showing more OT lines integrated within TCW, but they overdone it this time with "Size masters not." Perhaps they wanted to add that line in, but it ended up not sounding like it. "You don't have to be tough to be tough"? To me, that's something completely different.