I'm assuming that either a) these are just marlies players and nothing more or b) these are supposed to be bottom 6 players for us when we trade someone who is in our bottom 6
Veronneau is a C level prospect. Speedy 3rd or 4th liner would be his ceiling. He was lost in the shuffle in Belleville. The Senators have a lot of forward depth. He was a heavily recruited College Free Agent who chose Ottawa. Being from Ottawa probably played a big part in him choosing them. They also gave him some time in the NHL last year, which I imagine was part of the recruitment pitch.
It was made known a week or so ago that he was available via trade. It has never been reported that he asked for a trade, but a lot of people have made that assumption based on his usage in the AHL. It really doesn't matter either way. The trade was probably the right thing for both sides. The Senators might get an asset out of it, and Veronneau goes somewhere else.
Luchuk coming over is probably just a contract dump. The Leafs were at 49/50 contracts.
I guess a big consequence of this trade is that the Senators are helping an AHL rival. That's probably not good.