Given how the DBZ anime added more Saiyaman stories, it would have made for an interesting one shot story to see Gohan having to stop a robbery/crime committed by Launch. Plus, it would mean one less episode of padding.
April yes, but again, 1987 Splinter is also the counterpart to Hamato Yoshi, so I can only wonder what 2003 Splinter would think of an alternate form of his owner being a mutant.
Now Casey Jones meets Casey Jones would be a laugh. 1987 Casey Jones finding out that his 2003 counterpart is married to April, while 2003 Casey observes the more wacky antics of his 1987 counterpart.