Imho yes there's just no way it's as simple ( and stupid ) as cutting off your arm lol
I guess for the marked ones the only way out is stay out of range ( if you have the lower mark ), if Imu releases it or gets killed, or someone beat the crap out of you and kills you before Imu takes over again.
I guess u could save Domi Reversed people since they have no mark once out of it Imu has to domi reverse you again.
So yeah if he gets close enough to Imu i think he'll get controlled and grow back his arm.....i wonder if that's why he left Elbaf as well apparently Gaban knew sh** was gonna go down soon probably Shanks knew as well so that's why he dipped ?
Would also explain why Shanks has to always be moving and not having an actual base ?