Keep in mind, this is just one of the many rumors out there.
It's been said by people close to Bill Parcells that he's been contacted by the Browns to take over as THEIR new head of football operations and that he's shown some interest. As farfetch'd as it sounds, it makes a certain amount of sense.
Jim Brown was quoted as saying "Lerner is talking to one of the greatest minds of football as we speak". He never specified who it was. Holmgren has said that Lerner has not talked to him yet but that he is interested in the Cleveland job.
Parcells has a history of going all over the league and turning terrible franchises into legitimate contenders (i.e. Giants, Cowboys, Dolphins, Patriots). He's essentially become the guy who can DO ANYTHING. It's possible that he could see Cleveland as his chance to turn around a franchise so bad that bringing it success would finalize his name as the greatest in NFL history.
Here's the kicker: Parcells' current contract allows him to quit anytime he chooses AND continue to be paid. This means that he would have no contractual obligation what-so-ever to remain with Miami if things became sour.
The chance to get Parcells would also explain why the Browns havn't jumped on Holmgren. If Parcells becomes Cleveland's Czar, their's a greater chance Mangini hangs around (the Belichik connection) as opposed to Holmgren who would want his own guy coaching. This may also increase the chances of bringing in Weiss as our OC.
HOWEVER, if Parcells says "Thanks, but no thanks", the Browns may end up missing their chance to grab Holmgren as he may have a better offer elsewhere. So which is it? Roll the dice on Parcells? Or take Holmgren now?