This is a great question! It might be one of those things where different people have different assumptions about how it is going to work, and the next step is to find out that other people have different ideas. 
Related, ECC and ZF just agreed on a final ZIP 1014 text and committed it to github, and I posted ECC’s rationale for it in this thread: Final text of ZIP 1014 . It touches on your question by indicating that — at least in ECC’s view — ZF and MGRC should be independent from each other in how they answer questions like this one.
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