I think its definitely in favor of the guy giving up LT and Gore.
LT is no longer a top 10 back, he's firmly in the middle of the pack now. Gore is still top 10 though, although an injury risk.
Fitz is a #1 WR, with higher value in PPR. Grant has underperformed, but I say is worth more than LT at this point, and has had some good weeks recently and is on the rise.
Of course it all comes down to relative depth, but in the absolute I don't think an unfair trade, but I'd definitely rather be getting Fitz and Grant. LT just has name value at this point.
Also, at this point in the season, you're looking at week 14-16 matchups as well (playoffs).