Mulberry rootstock id

I had a Geraldi dwarf grafted mulberry I bought from Raintree that was lost in the last hurricane. The rootstock is coming back and I would like to know if it is worth keeping. The leaves look strange. What type of mulberry is most used commonly as a rootstock?

That could be geraldi depending on where they grafted it. Chances are its morus alba.

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It is coming from below the graft, I keep hoping something will grow from above but no sign yet. The leaves also look very different from Geraldi.

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I love the foliage, very cool