1. He is a strictdisciplinarian. (Is strict necessary here?-- Semantically, no; collocationally, yes. It is almost a set phrase.)
2. He is a man of discipline. ( Do 1 and 2 have the same meaning?-- No. This one means that he disciplines himself; #1 means that he disciplines others.)
3. To put it in a nutshell he is objective in grading his pup