F6 - it doesn't resolve - it's not there to resolve - it's there to sound right and, in chord theory terms it floats, it's "says" the story continues.
This is where standard progressions lose me...people have become deeply invested in the road as laid out in the 19th C through submersion, cultural imperatives etc.
I think it was a fine choice, gives a slight The Beatles voice to proceedings and the fact that it pricks up ears is a plus.

Cheers
rayc
"What's so funny about peace, love & understanding?" - N.Lowe