I think that lack of defense from Anthony and Love is blown way out of proportion. Anthony has shown that when he's engaged he can be a very good defender. The only issue I see is that Melo thrived at the PF spot and with Love he would slide back to SF.
Rondo, on the other hand, is an excellent defender. If you have Rondo-Melo-Love and a rim protected big like Asik then a lot of Love's defensive struggles disappear. Here are some numbers:
DRtg is the number of points allowed per 100 possessions.
KLove's DRtg was 104 least year (106 for his career)
Durant's was 104 this year.
Gary Payton's career DRtg was 106.
Serge Ibaka's was 102 in 2013/14.
Anthony Davis was the same as loves, 104.
Omer Asik's was 103.
So by this metric Love allowed 2 more points per 100 possessions than a DPOY candidate. Love's DRtg was actually better than his front court partner's. Pek's was 108. Certainly Love is no Joakim Noah (95.82) but he's also not Zaza Pachulia (111!).
Oh and hilariously Love's DRtg was better than Tyson Chandler's last season.If you want more, Love's DWS (Defensive Win Shares) were higher than Andre Drummond, Chris Bosh, Anthony Davis and Marc Gasol.
This is all to say that individual defense isn't easily quantified. No one thinks that Love is a better defender than Tyson Chandler or Serge Ibaka. Their defensive ratings aside, the eye test is all you need to see to convince you of that. On the other hand Love has never played with an great defensive players and he's never played for a competent defensive coach. Give him a ball pressuring PG and a rim protecting big and I guarantee you he plays defense as well as Chris Bosh. Bosh's DRtg was 104 last season, 105 for his career.
As for Anthony, his DRtg was better than Jeff Green's last season and, surprisingly, better than Luol Deng's. Here are some people who had the same DRtg as Melo:
Thaddeus Young
Josh Smith
Iman Shumpert
Tayshaun Prince
Shawn Marion
Kyrie Irving
Shane Battier
Not guys often thought of as defensive liabilities.
Anyway my point through all of this is that you can't call Love and Anthony defensive liabilities until you get them in a defensive system and they make errors. They certainly aren't elite defenders by any stretch of the imagination, but they aren't sieves either. On top of that they are both gifted offensive players, easily top 10 players in the league, and the notion that a team wouldn't want them both for "defensive" concerns is ludicrous. Give me Melo and Love any day of the week. I will make that work.
But for the record I think getting both players is about as likely as getting LBJ. It just doesn't seem possible that two teams give us their top 10 players in one off-season. Not that I'd say no. Maybe Rondo can work Dwade style miracles.