Wow.. HSL is really weird then.. Flying pilot normally made all ATC traffic calls. Non flying pilot just backs him up in case he missed a call..
No we usually (individual AHC preference) have the flying pilot do the talking with the only exception being in a CAS role (reading back info etc) and FAC(A) (front seat talks to CAS agencies etc, back seat (guy flying) talks inter-section.
The HMLA as a community does not have a reputation for radio diarhea of the mouth though.