Don't forget about the York-South-Weston/Ferreria and the DiNovo/Parkdale-Hyde Partk by-election wins too. Those can also be attributed to Howard.
As for Mr. Bisson, his organizing and riding building more than proves that he's the only candidate with that experience. Building ridings means getting members and raising funds, which Mr. Bisson has done in spades. That's why the 10 Northern Ontario ridings, which is less than 10% of the province's ridings, make up more than 25% of the members of the party, not to mention the 6 brand new MP's elected in that region. That just didn't happen by accident, that is a result of extremely hard work on his part and others in the North. He has the experience in building ridings up and making them strong, and for all Mr. Tabuns' nice qualities, that's something that he has never done himself.
If given the choice between the person who's talking about building up ridings and the person who's actually done it, I'll take the one that's actually done it and that's Gilles Bisson.