Both versions of M. Leroy are too perfect to choose...USE BOTH!!!!!!! you should rename one of them. you should make the older one flirt around Fiona i would love to see pen and Marshall lee's reaction to that. use the younger one to be Finn's best friend, poor kid with Jake being a grown man who will play with him? to be honest i don't think pen will like the Finn and Jake play-date.
I'm torn! I love the idea of an older M.L for some reason I can just see him bothering Pen and just teasing the heck out of Marshall Lee. XD Though the idea of a younger M.L. is just too cute. Finn could have a friend and the two of them together would be epicness. Finn needs a friend!
See this is why I am torn. What I do know is that either way would result in greatness. :3