I don't believe that. Yoshi looks complicated as hell. @_@
But yeah it's mainly projectile combos. Young Link should be played in a more campy play style. The auto combos are like:
Bomb - > Dair/Uair/Nair
Boomerang angled up -> Dair/Uair/Nair
Think of his projectiles as a safe setup.
If you rush in without projectiles you can do the following for BnBs:
Against Fast Fallers:
u-smash -> u-smash(if they don't DI correctly. Most people don't).
u-air -> u-air(if you're on a platform, you can u-air a few more times for extra **** by performing a u-air as you drop through the platform. This will send them upwards, but still close to the platform to perform another u-air as you're jumping up towards them again. Its pretty **** if you do it right).
d-air(bounce three times on them with one d-air at low %s) -> u-air.
n-air ***** all fast fallers recoveries.
u-air -> d-air
Against Medium Weight(YL, Sheik, etc)
u-throw -> u-air
n-air -> n-air
u-air -> d-air
Against Floaties:
n-air -> n-air -> n-air(you can keep doing more n-airs until they are off the stage or perform a d-air or u-air for a finish)
n-air them while they are short hopping -> grab
u-throw -> u-air