Doesn’t make sense to me either.
It's like you mentioned DNS or "ip host" entry that resolves hostname to IP. 
Any leftovers "crypto isakmp peer hostname" by any chance ? Or a wild card 
0.0.0.0 pre-shared key ?
What happens if you remove the part for aggressive mode ? Does R1 authenticate 
R7 ?
I remember there was a trick in one of the labs and even an error in the 
solution guide but in your case it is kind of academic.

From: Imre Oszkar <[email protected]<mailto:[email protected]>>
Date: Thursday, June 14, 2012 2:57 PM
To: ccie security 
<[email protected]<mailto:[email protected]>>
Subject: [OSL | CCIE_Security] aggressive mode with hostname IKE ID

crypto isakmp peer address
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