Ben Harpur - not an NHL defenseman. His impacts have been horrifying in his 103 game NHL career, and there is a reason that he hasn't touched the ice with the Leafs this season. That being said, he somehow made his way into over 100 NHL games by age 25, and is 6'6", so I wouldn't be shocked if a few of the old school GMs out there were interested in acquiring him, even if it isn't necessarily a prudent move to make. If we can get something positive for him, it's absolutely a win, because the Leafs aren't going to be using him anytime soon, he's far down the depth chart, and for good reason.
Jeremy Bracco - this one makes sense, and has been speculated for a long time. If there's a time to trade the guy, it is this season. At age 22, he's progressed every year in the AHL, and last year proved that he's done all he can do at that level. The fact of the matter is, his value will never be higher than it is now, with his current age, contract, and recent production & numbers. He is a great player, and in the right situation on the right team, I believe he has the potential to be an impact NHLer. The problem is that his skating just isn't up to snuff for the NHL level, and on a team like the Leafs, who already have Marner & Nylander on the right side, and aren't lacking in talented guys to man their PP units...a slow skating, cerebral, smallish right winger isn't likely to be called up for 4th line duty anytime soon.
Dmytro Timashov - makes a little less sense to me. Totally, he's an expendable asset in the sense that we have a lot of guys who can do what he's doing, at, or near, the same level. In a perfectly healthy world, he's probably not even in the lineup anyways most nights. So I get why he would be available in that sense, but I'm not sure why Toronto would be shopping him? He's 23, very cheap on a cap-strapped team, is pretty solid in all areas, and despite struggling under tough usage during Babcock's time, he's started to flourish and find an offensive game under Keefe. So again, I'd be totally willing to trade him, but he's a good player who fits with the vision & style of this team well, so it's odd to me that he specifically has been made "available".
All together, this isn't a huge package. Realistically, Harpur shouldn't be worth any assets, and while Bracco & Timashov are a pair of young wingers with bottom six talent, neither is a top level prospect likely to bring in any huge return. If anything, I could see all three of them being pieces in part of a larger deal. We'll see though. Dubas has never failed to surprise with the trades he can pull off.