as a MT grit depends of 2 things, emity and healer skill, ppl tend to speak about tank out tank stance on boss like you will always have a perfectly AST/SCH how shield you perfectly and a WHM/AST how manage he regens perfectly, thats false, more with pugs, grit offer much more to the team when you healer skill is unknow or just moderate, accidents deaths on tanks tend to be a lot much more punishing even more with tank swap mechanics how includes debuffs on youcan make you OT insta die in the next tankbuster.

but in the case you have 2 healers how know they job and work together well then no doubt get the emity lead and drop it, as a OT there is no excuse to stay in grit.

in the end depends more of you teammates.