I think the issue is who will give up the most for the ability to throw money at KLove in 2015/16. KLove isn't going to opt-in to the last year of his contract in 2015/16 if for no other reason than it's fiscally irresponsible. The real question is what will a team give up to have Love for 1 year and then be able to offer him more $/years than any other team. I think two 1st round lottery picks is probably too high a price for that honor, especially because Philly is in a pit of despair and KLove is tired of losing. Cleveland has no coach, fired their GM, have an all-star who is rumored to want out and have shown that they can be beaten even when dealt a royal flush. If those are our competitors then I'd call the Celtics front runners in a big way.
The great news for the Celtics is that have a winning culture. We have a leader and champion in Rondo, tons of financial and asset flexibility and a coach that is respected league-wide. We also have the best fan base of any team in the history of sports (end editorial).
I doubt Cleveland/Milwaukee/Philly offer their top-3 pick for an unguaranteed KLove. I'm not sure if I would give up a top-3 pick if we had one. Giving #6 is far less of a gamble and, because we have Rondo and a great coach, we have the leg up on resigning Love over either of those teams.