I believe the Monk in Pantheon is in a situation to become an actual main full tank, not just off-tank in the right hands. Monk has a "Taunt" effect that forces the creature to attack the Monk. This effect flat out wonderfully accomplishes 1 out of the 2 tanking mottoes/aspects.

The 1st aspect: keeping a creature's attention thus attacking you and not others.
The 2nd aspect: capable of surviving the duration of a fight.
The 2nd aspect will of course need to be solidified, which will likely happen through gear, buffs, debuffs, etc...

I've already started preliminary theorycrafing and seeing as how mitigation/survival needs to be polished more, it seems the Skar race is the most suited for a Monk Tank.

Skar have an advantage against the Predatory disposition (+X% to damage dealt, -Y% to damage received. May also nullify certain aspects of the disposition’s effects)

Increase max HP by 5%.

And that the Stamina stat will be highly valued.