The one position that I can see Taysom being as good as the players who play that position is TE, but that is because the Saints are have been deficient at TE, both in playing the personnel (why they kept throwing the ball to Cook and not Trautman who flashed?; TE is mostly a blocking position since Graham, Watson) and picking the personnel (Cook... no one since Graham, Watson) . But RB, WR, no.
RB's, obviously not better than Kamara, and I don't think he's better than Murray, and Murray lines up as a RB and there is virtually no risk of him throwing the ball.
WR's, obviously not better than Thomas, but is he a better receiver than T'Q? Deonte? Callaway? I don't think so.
And just to clarify, I am not downplaying what Taysom does, in that he can play all of those positions and play them relatively well, but that doesn't mean the players who actually play those positions 100% of the time cannot do it better than him, which I think they can.