The way he's played in December - the best two-way PG we've ever had. Period.
Alvin has never been an offensive point guard. Damon has never defended at Lowry's level, and neither has Calderon. I have no clue what Ford and Jack are doing in this conversation.
If he can sustain this level of play for the rest of the season (assuming he finishes this season in Toronto), he'd be top 5 in the league and most definitely the best in our club's history.