brov1ehhh in terms of dalbellos i think they make much better models with the same last and fit. i happen to ride the Lupo Sp Id and i love them so i love dalbello in general but the pantera 100 is built more like a really soft heavy big mountain boot that i just really dont like. if you like the fit id try out the Krypton Fusion as its got a similar fit and is made for park and all mountain
ps i work at a shop so im not completely clueless in my opinions
The kr fusion is a 98mm last vs the 100-102mm last of the panterra so if his bootfitter has told him he is a 100mm last he may well struggle in the fusion. its also a freeride boot as apose to an all mountain boot, not that it really matters but yeah, you might want to rethink your last statement there bud.
Obviously its difficult to reccomend boots without having a proper look at your feet first but just of similar boots you could look at:
if the hike and ride feature something you'd like to keep? The Rossignol all track pro 100 might be worth looking at. 100m last 100 flex, slightly lower volume than the panterra.
Also you could look at the lange xt100 (make sure you dont go for the lv version as this will be narrower and lower volume)
if you dont mind about the hike and ride mode. Atomic hawx 100. Its a memory fit shell so out of the box it is 100mm last but if you chuck them in the oven you have the option of stretching out to a 106mm last boot.
The salomon xpro 100 features an almost identical technology in custom shell. again out of the box at 100mm can expand to 106mm.
You should also be talking to your bootfitter about custom footbeds. They'll not only improve fit of the boot but also peformance because you'll have a much greater proportion of your foot in contact with the boot which means greater control.