Solarz:
The samurai for me is a medium skirmish force, the killing blow is meant to be the rain of arrows from both the mongols and the english. This is because, for both the swiss and the Bowmen, they need time to setup while the samurai historically have proven to be disciplined and quick to react to threats. they are vicious skirmishers able to attack and retreat on command which makes them ideal for engaging a sudden enemy whom just appeared to buy time for other troops to setup.
I am willing to trade samurais for Rajput warriors.
On the issues of knights, knights are not particularly good troops in my books, being limited to fields where their assault charge is the most telling. where in the desert heat, broken land, forest, barren cold, swamp. their combat effectiveness drop off considerably. so for my force, their purpose is really to counter charge weak spots in my infantry line.
siege equipment, is a hard one when ambushed, simple traction catapults only require only moments to setup, - the baggage train, can quickly be locked together to form a fort. - don't take Hollywood for historic ambushes, there is only several instance where an entire army is ambushed and destroyed in moments - such as Hannibal at lake Trasimene.
depending on how relaxed are the rules for siege equipment, if large chinese repeating cross bow with poison tips:
or Chinese/Korean MRL (13th century)
or mounted flamethrower:
will be quite a deadly array facing ambushers.