SSJ4 Vegito

I see where your coming from but let's not forget Goku had already been blasted Point-blank to the chest (While trying to get to Gohan) then he managed to walk through a volley of Ki blasts and then when Goku's arms where to injured to block anymore, Goku got blasted once more in the chest.
I also think that Vegeta & Trunks were only through their 1st trip in the Room of Spirit and Time. Vegeta did get slammed at high speed and finished with Broly slamming him into a wall and he was able to get up unlike the rest of the Z Fighters (Except Goku) while Trunks was charging along side Gohan he got rammed with Broly's forarm. Then when Vegeta finally shows up Trunks gets our of the rocks and jumps in front of Vegeta blasting Broly but Broly uppercuts him and then he's out. I've always thought Piccolo had a chance of being stronger than Vegeta & Trunks after their first run through the ROSAT. I always placed Gohan on-par with Vegeta & Trunks. So really with as large a gap that there was between MSSJ Gohan & Piccolo if Piccolo could survive the blows even better than Vegeta & Trunks. I just don't see them being Mastered SSJs but it's not unreasonable to think that they're Mastered SSJs either. Which is really why I made the point of making a double thread since I didn't want to start another argument over Broly's strength.