Downing a boss the first time takes by far the longest. After that things just seem to get way easier. Doenst matter if you wiped 10 times, 100 times, or even 500 times, before the first kill. Once its down the first time, repeating it is not nearly as difficult.
And of course there's a difference in difficulty when you are taking a group to a raid and gearing up normally/exclusively on 10, vs bringing your best geared people from 25, who are half/nearfull 391 to a 10man raid. Its the difference between 2-3 pieces of 391 gear per person, vs 5-full 391.
Oh look. 4pc on every one of those toons.
Until they have a 10man that gear exclusively from the 10man, Nothing they 'SAY' now means anything, simply because they cant compare them equally.
Either way, short of the comment about 10s, it doesnt take away the feat. Congrats to Paragon for completing it on both raid sizes.