There is no need for apologies
Essex, tangents are more than welcome! (especially when they are interesting tangents like that one).
Boromir, I realise that Saruman found it easy to corrupt the Rohirrim. However, in Meduseld, and without Saruman, I find it unlikely that Grima could hold such sway. However, I like your point about the difference in attire. Could be a crucial factor here.