I don't think Yellow has the SKS unlocked since he just did the RFB. I really like the SKS myself. However, if someone else made a macro for it, it's likely I wouldn't use it since the settings (lean sens./mouse sens./FoV) would be different. Most of the macros listed that aren't Yellow's have different settings. I would prefer not to have to change my settings everytime I wanted to use a different weapon. Hence, why I use only Yellow 13 macros (standardization of settings).
If I'm wrong on this, and there's a way to change the settings (on the fly), please correct me. Otherwise, I think some standardization of macro settings would be preferable.