All I was saying is, with plenty of other mechs more suitable for that role, using Rifleman as a second line brawler is a bit strange. In my book, Rifleman was always the one standing on top of the hill with some PPCs, packing some long range punch (since he is most useful there) while some LBXers do some real damage.
You can say the same about every mech in the game. What matters though is the fact that you can be more efficient and helpful to the team in that specific role sitting in mech which is more suitable in given situation.