Ouch, that's an expensive renewal. Do you happen to know the reason for the lapse--did he not have the requisite number of qualifying dives within the 3.5 years allowed, or was it just a matter of failing to send in the paperwork?
In his case, lack of tech diving in general and to some extent lack of being active as an instructor and in the agency.
While everyone likes to try and point to some hard "rule" on renewals the reality is that for both divers and instructors its fairly flexible if you are meeting the intent of the renewal expectations.
Tech1 and Cave1 are both fairly easy certs to remain current on. Tech2 and to a lessor extent Cave2 is dang tough to get the dives in depending on where you live and seasonal issues.