Thompson is not up to it.
The dropped ball for the Lomax try can happen, and the penalty try was a bit dumb, but at fullback that happens (All be it, it happens to Thompson alot more than others…plenty of examples of this stuff last year).
But mainly, he is out of position every set. Saints could have scored 3 tries off kicks in the first half just on the basis of his position play. Even the dropped ball off the grubber was because he was out of position and had to run at a ridiculous angle. Then in attack, he completely stifles our backline sweeps.
Then of course, he makes more basic errors at the back than any other fullback (He did the same thing vs Dragons, Raiders etc last year).