"'12Donnie would be jealous of '18Donnie because of this"" '12Donnie would be jealous of '18Donnie because of that" "'12Donnie would think he's so cool and capable and feel insecure and-"
'18Donnie watching '12Donnie pipe up with information about their current mission and '12Leo immediately listens intently, maybe even going over to him to look over his shoulder and see his screen
'12Leo momentarily being out of commission and '12Donnie begins barking orders at '12Mikey and '12Raph. '18Donnie watches them not only listen to his plan but rush to follow his lead
'18Donnie's brothers need non-tech expertise and '12Donnie comes in the clutch with a list of facts and the solution to their active problem
'18Donnie's fancy staff gets broken or knocked from his hands, and he looks over to '12Donnie only to realize that he's been taking down baddies with a random object he borrowed from their surroundings
'18Donnie has done nothing but brag to '12Donnie to show off since he appeared and '12Donnie has always conceded (if not reluctantly) to how impressive his tech is and how much more professional his inventions are and hasn't fought his superiority for a moment. '12 has even talked down his own 'junky' equipment in favor of promoting '18Donnie's, which takes the steam out of his pride (though he can't name why)
'18Donnie slowly beginning to realize how much '12Donnie can accomplish without being backed by high-powered equipment.