When discussing the variety of endings to the game, one ending is conditional upon your Shepard being or having 100% Paragon or 100% Renegade.
The ending where you convince the Illusive man to shoot himself in the head.
Does 100% mean that you've filled the bar completely or does it refer to 100% of the choices you made were P or R?
Since at least one option seems to bestow 5 renegade points on you, whether you want them or not, does that mean the ending is in fact only available on a renegade path?
If you've missed a paragon pop up could you end up with too few points or are there more than enough to fill the bar all the way? (I am thinking specifically of the pop up where you comfort Steve Cortez after he puts his picture at the grief wall in the temporary housing area).