This was an annoying one.
First off, I wasn't against the idea of Son at LWB against Swansea, just because the offensive threat would be so low, his defensive responsibilities wouldn't be too high. Although, when it was getting clearer we likely weren't going to score I think Poch got it wrong.
Moving Trippier to LB was a terrible mistake. He didn't take on anyone or even show the threat of crossing with his left. Poch basically neutered Trippier's best assist with his crossing by doing this. If he didn't want to play Davies at all, he should've just played 4 atb with Verts at LB. At least we'd have some semblance of a 2nd threat on the left side. In the second half, especially once Son was taken off, which I thought was the wrong sub (Should've been Alli who was poor), all attacks came from the right or middle.
Now we should've had 1 maybe 2 penalties at minimum but that's not an excuse for losing this game. I think Poch got his adjustments very wrong and it was a big contributing factor to the draw, which feels like a loss.