Thanks @pfunk!
7 day hiatus on voting - would that will still be a "Magic Show" if the SP is usable by the owner right after it gets used by the borrower and returns to him? If not, and one has to wait 7 more days, then 2 weeks of down time for one week of delegation would likely kill any short term use of SP delegation.
How does the averaging SP prior to delegation work? Interesting.