No, you are not unless it specifically says that when you hover over that it is due to low skill level or a low primary stat(like intel for elemental spells),Melee Power Stance won't as it's low level and you have Man at Arms 1.
A higher stat in STR can give a boost effect to Man at Arms skills however. This works for other skill types too (Intel/Dex)
It's important to understand that Skill level is different from level required for a skill book.
The ability level (1-5) gives you a range of usable Skill levels per point without a penalty, if that helps. I don't know the exact ranges but I suspect ability level 1 is a spread of skill levels 1-5 or maybe 1-4, and so on.
Last edited by Azureblaze; 08/07/14 10:45 PM.