(1) Option D
Way way back in the rear view mirror
(2) Option A
(3) Option C
Not happening -- Option B, and/or a Glen Davis sign and trade.
I still think a minor sign and trade of Davis that gives the C's either a trade exception, or a role player that the team signing him didn't need is just as likely, if not more likely than a trade of Allen or Rondo. And I also think that a trade of Rondo would be more likely than a trade of Allen.
I really think the C's are going to be very cap conscious with any moves this offseason, and that is why I really doubt they will move Allen unless they are getting an upgrade, AND cap relief next year...and I just don't see many packages like that out there.
But by trading Rondo, they may be able to get a little more cost certainty over the next few years, and also solidify more than one position with his (soon to be increasing) salary slot. I don't think that its likely to happen, but moreso than an Allen trade.
And while a Davis trade would be more complicated, these are professional GM's, and don't let a little extra math stand in their way of making deals. It all depends on which teams show interest in him, but if it is a team with cap space, I would be shocked if it is not a sign and trade in which the C's send cash, and get back a trade exemption, and if the team is over the cap, I would not be the least bit surprised to see Danny try to leverage a deal where he turns Davis and a couple of the spare part expiring deals into a rotation player or two, by threatening to match an offer.
Ultimately though, I think Davis comes back on a 2 year contract (as does Powe), they sign a veteran big man with the MLE, and then between a minor trade of some combination of Tony/Scal/Giddens, as well as the LLE and vet minimum, they bring in a veteran PG (or possibly Marbury) and veteran wing.