Coach Casey is probably going to regulate the minutes Lowry gets through the stretch run of the season so that he is not worn down for the playoffs. The last two post-seasons are evidence of that, especially last year against Washington when he simply had very little left in the tank when they got swept by the Wizards.
With the Valanciunas injury, it gave Bismack Biyombo some extra playing time, and that gave the Raptors a better look at what he brings to their lineup. While not a dynamic offensive player, he does provide something that they've lacked in past seasons, which is a strong rim presence, who can alter/block shots, and a strong rebounder. Those a little older here should remember Charles Oakley and his time with the Raptors. He was similar in that regard, though he developed a mid-range jump shot that made him even more valuable.
Biyombo is going to be coveted by other teams who need a solid rebounder. He could potentially be a guy who could average a double-double in the NBA (points and rebounds), though it might be something like 10-11 points and 12 rebounds, something like that.
It's going to be an interesting stretch run, and hopefully they can win a round or two. Personally, I don't care if they overtake Cleveland for the top seed in the East, having them ready to go in the playoffs is more important.