Obviously Dathan has to go into this race with the mindset that he can run well off the training he's done. That's just who he is. He and the Hansons took a risk by sacrificing a bit of fitness for health and it got him to the starting line in one piece, however I think it's pretty obvious he could have benefitted from getting a little stronger.
He hadn't finished a marathon since like 2016, so I have to think this race will simply serve as a stepping stone to get some good momentum started going into his races going forward. It's not a great result by any means, but he's healthy now and maybe he can build on this. The guy ran 61 earlier this year, he's hardly finished.