Don't agree with those ratings.
I though Foyth was shocking and Lamela was a 7.
You might be right on Foyth - it wasnt that he did anything wrong, but playing in an unfamiliar position, just didnt do anything worhwhile.
Lamela ran around a bit but didnt really create anything or have shots on target, so whilst not as poor as Dele and Moura, really not worth more than a 5 - a 7 would have entailed him doing something which we expect of AM's, which he didnt. Sadly true of too many of the Spurs players today, failing to do the things expected of players playing well in their respected positions.