Nelson's value has been all about the long ball. He is 12th in yards (782) and 28th in receptions (44). He is 7th in yards/catch with 17.8, and none of the six guys ahead of him have more catches - in fact most of them are in the 20's. Look at the game logs, it's ridiculous, he has longs of 36, 84, 50, 93, 64, and 40 in various games.
All this to say, some games the 50+ TD isn't going to be there, (Jones got it this week) and of course the stat line is going to suffer. I don't know what his snap count was this game but I doubt it was much different than usual. He caught four balls, which happens to be exactly his season average. He did miss at least one catchable ball that I remember.