note that renting of II exchanges is expressly forbidden under their rules.
		
		
	 
Yup, it could well be that someone (contrary to II terms and conditions, as already noted) obtained an exchange and is now attempting to rent it out for profit. 
It certainly wouldn't be the first (or last) time that someone tries to make a few bucks by inappropriately renting out a week obtained by RCI or II "exchange" --- although that act (clearly prohibited by 
both II and RCI) still doesn't explain just how / where "Sean Vacations LLC" enters / fits into the picture as an involved party.  
The last "contact" name of the RedWeek member may well not be their 
actual last name, since RW members (just as here on TUG)  choose their own RW 
user name, which (for initial privacy protection) certainly need 
not reflect their actual last name; I know that my own actual last name is not my 
user contact name on RW (by my deliberate choice). There is no need for any identity revelation / verification until matters get down to the brass tacks of "money on the table" (or at stake), IMnsHO. 
Again though, it's entirely unclear (...to me, anyhow) just where or how (or why) "Sean Vacations LLC" also somehow enters / fits into this picture. 
In 
any case, submitting full payment for a rental before verification of reservation legitimacy is both profoundly unwise and very premature --- at best. In any scenario, if the reservation was made by II, as indicated by the resort, then this is seemingly an "exchange" situation, in which case it is not appropriate for that reservation to be subsequently offered out for rent in 
any scenario that I can envision --- with 
or without the additional, unexplained involvement of "Sean Vacations LLC". 
Personally, I'd 
run (...not just walk) away from this questionable "rental" while the money involved is presumably still retrievable. Much too shaky for my liking. YMMV.