I'm in the same boat, I don't know what's being argued exactly but my sense is some are implying Tavares is a product of Marner, which imo is pure stupidity.
Tavares, with Matthews like linemates has cracked 30+ goals and 80+ pts multiple times. With the best wing he's ever played with he hit career highs, likewise, Marner reached his totals because of Tavares, plain and simple. Marner is the line driver but let's not forget JT is more than capable of being that guy, they've found a bit of chemistry together and helped each other, that's what the narrative should be.
A few people say Marner set JT up for tap ins all year - I guess to try and make one look better than the other, I count something like 4 or 5 of those and a hell of alot more nice shots. For anyone who's forgotten, I posted a video below of all of his goals.