Drake wants Mjolnir. Can he take it from the Thunder god? Shassa works for S.H.I.E.L.D. and is there to arrest the Hulk for numerous crimes. Can the Sigil bearers take it?
Drakes sigil empowers him to accomplish a specific objective, usually by physical force. He has to be very specific and state what his objective is, and then his sigil powers him up for the task.
Shassa is like Rulk at the height of Loeb Force. Her sigil lets her feed off of an opponents power to amp her own stats, but it doesn't drain the opponent. She also is an excellent h2h combatant.