Ken, You are both talking at cross purposes. Yes in tactical formations level turns are ofter done but you are NOT in close formation.
Even in close it can get scary if the leader is a plonker. I flew a mixed C130, 2xKingAir and 2xHS125 formation. The HS125s were on the outside of a big Vic. When the lead C130 ended up at 250ft agl (due to being on the wrong pressure setting) and then went into a 30 deg turn - guess what height the inside HS125 was at. When you get squeezed between aircraft and the rocks it is not too great!!
There is more to mixing different ac types and pilots from different roles and backgrounds than meets the eye. Assumed knowledge can be very dangerous.