It's going to be rushed no matter how you look at it. They're going to be doing 2 chapters a episode no matter what. Looking at the episode list by 19 they'll be at chapter 41. By 38 they'll be at 82. By 47 they'll be at 100. The manga doesn't look like it'll end by 100 so that'll be like 2 or 3 more episodes at 2:1. Which would basically fill up the whole 50 episode run.
At most we'll get like 2-3 episodes that are 1 chapter to 1 episode. If they do any more than that they'll have to dock other episodes and try to fit 2.5-3 chapters in a single episode to even it out which would screw up the pacing enough more. Only way they can actually do it justice without fucking up the pacing is if they go beyond the 51 ep run. Which Bones won't do since they have a 51 max episode hard on.