If Daniels is going to contribute this season he has to be able to make open shots, because Giffey is better than him in every other facet of the game. That is why they play Daniels right, because they think he could be a scoring threat, but he hasn't been. He is shooting something like 34%.
I don't think statistics bear out your point that "Giffey is better than him in every other facet of the game."
I took their stats, and equalized them to 20 minutes a game (since Daniels plays more minutes, albeit slightly)
Daniels: 5.1 ppg, 3.3 rpg, 0.8 apg, 0.9 bpg, 0.6 spg, 1.2 tpg. He'd average 5.1 shots per game. He's shooting 34% total, 24% from 3.
Giffey: 4.4 ppg, 2.5 rgp, 0.7 apg, 0.3 bpg, 0.5 spg, 0.6 tpg. He'd average 3.2 shots per game. He's shooting 41% total, 44% from 3.
So, equalizing minutes, Daniels would average more points (by nearly a point), rebounds (by nearly a board), assists (isn't Giffey supposed to be the better passer?), blocks, and steals per game. Giffey has half as many TOs, but that seems to be from a lack of aggression (which I base off of his fewer shots). He's shooting fine, when he shoots. Which, it seems, he should do more. If
he's not shooting more, he shouldn't be playing, as he's certainly not doing anything more than Daniels that shows up in statistics.