JT Miller isn't even paid to be a 1C. He makes $8m per season. Look around at the top end 1C's around the league and compare his contract to theirs.
Mackinnon - $12.6m
Seguin - $9.5m
Benn - $9.5m
Hintz - $8.45m
Suzuki - $7.875m
Matthews - $13.25m
Tavares - $11m
McDavid - $12.5m
Draisatl - $8.5m this season --> $14m next season
Hughes - $8m
Hischier - $7.25m
Barkov - $10m
Aho - $9.75m
Jarvis - $7.42m
Kopitar - $7m
Point - $9.5m
Eichel - $10m
Hertl - $8.1375m
Scheifele - $8.5m
Larkin - $8.7m
Petersson - $11.6m
Crosby - $8.7m
Malkin - $6.1m
Stamkos - $8m (mainly a winger I believe)
Forsberg - $8.5m (mainly a winger I believe)
JT Miller is pretty much on par with the lower half of this group which SHOULD MAKE HIM A 2C. That should be his role. With Panarin, Kreider and Zibanejad just loafing around, it's thrusting him higher in the lineup than should be necessary.
this same exact argument should be made about Trochek who is paid, really, like a 3C. Especially with the cap increasing.