I think maybe you're on to something here, actually. There are 8 levels, 8 bosses. Perhaps Mega Man could fight a different robot master at the end of each level, and then, if you play through again, you get to keep all the weapons you collected, and you fight Wily at the end instead of another boss. So, basically, you'd have to finish the game twice, but you'd have all sorts of power-ups the second time through. Also, maybe you could even select which Mega Man game you want the robot masters to be from (Mega Man 1-6; Oil Man and Time Man would have to be added for MM1). Would the robot masters appear only if you choose Mega Man only from the beginning, or would they appear if you choose Mega Man even for just that stage? I guess another thing this would do is encourage people to play through all 8 worlds. Man, this would be awesome. It would definitely add a whole other dimension to the game, since you would have to learn how to fight all the robot masters. I suppose ideally they would appear in the order of their weaknesses, starting with the easiest boss from the chosen game (Cut Man; Bubble Man; Top Man; Toad Man; Gyro or Gravity Man; Wind Man). Like you said, perhaps it would take too long to implement, but it would definitely be sweet if Jay did this. Although, we never know. Maybe he is already working on this!