They can keep doing it as long as:

A) they keep an open spot on the taxi squad to put Morin (when Morin is up, they're at 5 with a max of six)
B) it's within 30 days of when Morin cleared waivers (after 30 days, he'll have to clear waivers again to be assigned to the taxi) https://t.co/yhqeGhx40j

— Charlie O'Connor (@charlieo_conn) January 23, 2021