You have completely contradicted yourself/missed the point that was been made. You are arguing that Messi should play RW as he can roam free and drift inside, but before you said of Lewandowski, 'Someone also said "he wouldn't have to stay on the wing". Why even bother to start him there?'
Why bother starting Messi on the right if he is going to drift into the middle then? Why is it okay to start Messi somewhere he won't stay but it's not okay for Lewandowski?
Messi will always play through the middle, he is our best goalscorer and creates multiple chances for his team-mates through the middle. It's not his fault that Sanchez and Pedro etc hug the touchline. Our tactics need to be mended, but that does not mean Messi should play RW, it makes no sense playing the worlds best player out of position.
Argentina play Messi through the middle but they allow the 'wingers' to have a free role taking up central positions. If Tito gave our wingers the same freedom they we could be much more effective against the likes of Bayern. Here are Messi's highlights from the game in question where you can see the movement of Argentina's forwards.
My apologies for going off topic.