This was just said during the local hour of Dan LeBatard's radio show. Apparently Riley had Gasol locked up until LeBron told Pau he wasn't coming back. This was before Riley was informed that LBJ wasn't coming back.
I don't have a link or anything but if you do a twitter search for "gasol lebron" you will see several people talking about it.
http://www.reddit.com/r/nba/comments/2g89tx/lebatard_on_the_radio_pau_gasol_was_set_to_sign/
Pau / Andersen
Bosh / McRoberts
Lebron / Deng / Granger
Wade / Allen
Chalmer / Cole / Napier
Hmm.. it could have been an extraordinary team. Bosh and Wade would have to take a substantial pay cut though.