It'd be an interesting fight because of Shields BJJ level.
I wouldn't as Maia grapples with heavy condecorated BJJ dudes while teaching them ( Mir and Gonzaga, for Ex.) and got them really surprised. Shields has zero to offer to Maia on the mat. I consider this fight a downgrade for Maia, if it happens.
"Although no one can go back and make a new beginning, anyone can change now and make a new end."