Because I want to make myself even sadder
Imagine the 2012 boys post season 1. They're in the peak of their first triumph against the Kraang, they're still on that "We saved the world!" high.
Now let's dump Two Souls 2012 boys in that time.
Their younger selves would most likely stumble upon them at some point. Even if they try and hide their presence, Leo is sharp enough to notice how the crimes lessened throughout the weeks and how each crime stopping corresponds to how his brothers handle it.
Push comes to shove, he accidentally stumbles upon an 18 year old Donnie sneaking through his younger selve's garage for supplies.
There's a chase through the subway stations and the TS boys have to reveal themselves.
Mikey was most excited out of all of them. His older self looked cool and strong, and a lot taller too. He wants to know the cool adventures they would have in the future and TS Mikey would indulge him with a very watered down version of the events. Mikey isn't dumb though, he sees all the scars.
Donnie was also enthusiastic. Two Donnies are better than one. He expected his older version would be sort of excited as well, or at least happy, but he was quick to ask him for help to get back to their own time. He looked tired and even if he's answering his questions, he looked like he didn't want to be there. Donnie doesn't understand why but he's just happy to help and happy to learn what he can.
What's baffling is that TS Raph was quiet. Sure, Raph is like that when he first meets new people, with a few biting remarks here and there. But he's completely silent. The only time he ever talks is if Splinter addresses them, and even that, he was stiff and his voice was forced. He gives whispers and looks to his younger brothers and they follow what he says. Their younger selves are so shocked because they can't barely even follow Leo properly, why would they follow older Raph like that?
That's another whole different can of worms as well.
There wasn't an older version of Leo.
Leo wanted to know how far he's come in life. He didn't really want to bother the older guys since they seem like they really just want to go home until Raph opened his mouth to ask where their Leo was.
The glass TS Raph was holding shattered in how hard he was gripping on it, TS Mikey's smile seemed a bit too cheery, and TS Donnie walked out of the room without uttering a single word his younger counterpart following him.
"He's... He's on the other side." TS Mikey answers.
"Oh... So he's stuck back in your time?" Leo would say.
"Yeah... That's why we really just want to get back home!" TS Mikey says with a forced cheer, he was already rummaging through the cupboards for a first aid kit he knows they have and started to wrap the cut on Raph's palm while slapping him when he tried to scratch on it.
"If you don't mind me asking... Do I... Do I become a great leader in the future?"
"You did great." TS Raph would say to him, it's his first time actually talking to Leo and not avoiding him, and getting that type of compliment from a Raph? He was grinning like an idiot. He said he did great!
Mikey and Raph looked at each other with horrified expressions.
You did great.
They chose not to say anything because Leo was so happy... And TS Raph kept looking at them, silently begging them to keep quiet.
