"Force multiplier" -- love that you borrowed this term from military doctrine, because that is exactly what a good tech lead is IMO. Per the Wiki definition [0]:
"Force multiplication or a force multiplier refers to a factor or a combination of factors that dramatically increases (hence "multiplies") the effectiveness of an item or group, giving a given number of troops (or other personnel) or weapons (or other hardware) the ability to accomplish greater things than without it."