Altair henchmen equipment shows up in the equipment list, thus allowing you to transfer all the equipment to other heroes.

Even worse, after the items have been given away, it is still considered their default equipment and they keep it!

So essentially, training 1 henchman allows you to fully equip another hero, and also have all that equipment on the henchman himself.  Or you can train a henchman and sell all that equipment away for gold.

Note: this applies to armour and weaponry, but does not apply for Equipment.

Fix: do not make the henchmen equipment show up in the equipment list!  If you want to give them additional equipment, it would replace their 'default', but you should not be able to transfer it away.