Doctor Belasco said I was thinking of, prior to designing him, making Michael a Slytherin in order to give Grant that connection, but then Logan would be in the same situation.
The situation of having no friends? I wouldn't say that, Logan could've met people any number of ways besides being members of the same House. There's the most obvious route, being Quidditch/Dueling club, or the more subtle route of mayhaps Logan scammed a couple members of the group and made it up to them with companionship and what not. Heck, don't Prefects/Quidditch Players/so on, so forth get their own special party in the Great Hall near the end of the year or something along those lines? Heck, Logan even gets access to that super exclusive bathroom.
It's all a matter of whether or not ya'll want to know Logan from previous engagments, or stick to knowing of him and his reputation from going to the same school, as it was my understanding we don't strictly need to know each other on a personal level to be going on this seemingly long-running traditional voyage.
though how lucky it was for her to show up right when Hufflepuff won back to back cups. She must've been the missing piece. 
