Bosh wasn't that kind of a defender when he first got to Miami.
And CLE is a different team. They have actually good centers that actually can play defense next to Love in Tristan Thompson and Timofey Mozgov.
Bosh's D did get extremely good in the last couple years in Miami though, no doubt. Also there is no doubt that Love is superior in every other category of basketball.
They aren't giving up any resources to keep Love. They can't sign anyone else if they let him go.
A sign and trade? Who are they going to get. And you can't use draft picks, because LeBron isn't letting them do that. He doesn't give a **** about draft picks and he shouldn't at this point. CLE has no reason to wait 4 years for rookies to develop. Especially since they traded Wiggens away.
But you're gonna tell me you are going to trade Kevin Love for depth? For depth? Get out of here with that, it's just absurd. The Cavs have plenty of depth everywhere, it's one of the reasons they're going to have to pay a fortune in luxury taxes.
The only time they don't appear to have depth is when Varejoa, Love, and Irving are all out for the season. That narrative is not applicable to the healthy team they will have next season.
Bosh wasn't a good defensive player prior to getting Miami, but he was good from Day 1 in Miami. The Heat were the fifth best defensive team their first year together and they were 4.2 points/100 possessions better when Bosh was on the floor in the regular season, and 9.4 points/100 possessions better with him on the floor in the playoffs in 2011.
http://espn.go.com/blog/truehoop/miamiheat/post/_/id/7964/chris-bosh-no-longer-just-a-one-way-player
I don't think Cleveland is particularly deep at all. They are deep at the four and five with Mozgov, Varaejoa, Thompson and Love, but you can only play two of those guys at once and really LeBron is probably the best option at four on the team. Their wing/backcourt depth is terrible. Irving is great but is proving to be very injury prone. Aside from him you have Shumpert and Smith, that's it for quality perimeter guys. That's not good depth. All the Cavs have to offer is the mini midlevel exception too so it's going to be tough to add guys any way besides a trade and Brendan Haywood and a late first round pick is not going to bring much back either.