Probably in a happier place in his personal life, he was still with ex wife during the first reunion, he’s probably more content with playing pop-punk again and not trying to be this huge area-music band that’s gonna change the world. Also the last time was because of Travis nearly dying, mark and time probably didn’t fully sort their beef out, just pretended like it different happen. This time round it was because of Mark nearly dying. Tom’s probably realised how silly their differences were and just wants to enjoy being with his friends