He learned a lot from this fight so he is definitely not the same fighter. They even trained together before Jan fight with Jacare. Jan is still improving and each fight after Thiago loss gave him more good experience and chance to work on his flaws. I know that Santos isn't the same anymore but even with his knees fully working it would be much different fight if they would square again. Last time it was 1-1 going to round 3 so if Jan wouldn't go full Garbrandt he could possibly win the decision. Currently as more confident and patient fighter he would be favorite against 2019 Santos imo.