The TMNT 2K3 series universe seems like it can really dig deep
Some other questions I wonder would be the following...
How are the Elite Guard chosen? How often are they changed? Because Yoshi engaging the Elite Guard in the 1960s and the Turtles fighting them in 2003 at Aprils. That is Forty year gap. Making them at the very most 60 ish. Of course they most likely aren't the same. Unless?
Do you honestly think Khan was one of the Elite Guards?