yes a sucker, luky you, now you have a second mission tree. let it grow a bit and when dormant in january or so of next year you can cut it from the mother plant or root, saving as much of its own root and plant it in its own pot or space, et voila now you have two mission trees.
Good luck with your figs, mission is a large tree very productive , a delicious fig. there is another fig site," figs4fun "with a large member base, lots of info lots of nice people.

Yes, I was going to say, not just to remove it (eventually), but remove it and make a new tree! Even if you don't have the space for it, maybe a friend or family member would like one.

Although figs do root relatively easily, but you can also try air layering to try to get the new tree.