I will try to simplify things.
The amendment CPC-7 is before the committee. We have to do something with it right now. If we decide by unanimous consent to withdraw it, after LIB-16 is adopted or defeated, another amendment—the same one, if it's still in order, which it would not be—could be moved. The clause would still be open for other amendments provided they are consistent with any other amendments adopted, for instance LIB-16.
It's kind of a matter of semantics. Whether you say “withdrawn” or “tabled”, it's deciding not to consider this amendment any more for now. If LIB-16 is adopted, then I don't think the chair will rule CPC-7 in order.