If SAR Divers are the gold plated solution to SAR
Nobody has said that sar divers are the best option, but free swimmer, or a portion of the SAR diver's skills and most of the kit used apart from maybe the breathing aparatus are of benefit to the SAR operation.
Generally the only time a SAR diver is required to jump with full gear and breathing apparatus is when submerging to get a ditched fast jet jockey out of his cockpit.....however in certain situations, such as upturned vessels or small boats/ dinghys, the rest of his skills and kit such as wet suit, buoyancy aid, fins, mask and snorkel are definately of use. sometimes you cannot get close enough to a small dinghy or liferaft without causing more distress due to the downdraught of the aircraft.
SAR Divers are now a minority in the RN, possibly due to reduced spending etc, however there is usually at least 4 Divers on the squadron and if required for a dedicated diver Job they can usually be called in to assist if not already on shift.