Ch Supt Grimshaw added that officers received reports of 11 sightings of Mr Fenton during the investigation.
The first figures for Moyles' replacement, Nick Grimshaw, are due in the next set of Rajar statistics.
"Whatever the circumstances, an individual from somebody's family has died today, " Chief Superintendent Grimshaw told a press conference.
They include 39-year-old David Grimshaw from Llandudno, north Wales, who was 19 and a promising young Welsh Guardsman.
The nominations were revealed by BBC Radio 1 breakfast show DJ Nick Grimshaw, who also had praise for the eclectic selection.
The panel will include John Grimshaw a founder of Sustrans, campaigner Pip Sheard, light rail businessman Trevor Smallwood and consultant Roger Key.
Chief Superintendent Nigel Grimshaw said that both victims were known to police.
But there was no nomination in this category for Radio 1's Nick Grimshaw, whose first and only consideration comes for best use of multiplatform.
Chief Superintendent Nigel Grimshaw said he could not "comment on disciplinary sanctions to individual officers" but said the PSNI has "learned many lessons from this investigation".
"This channel potentially could revolutionize the consumption of content in much the same way the Internet did, " said Rob Grimshaw, managing director for the Financial Times's Web site.
Ch Supt Grimshaw said Mr Fenton's mobile phone signal - traced 11 hours and 39 minutes after he was reported missing - had provided officers with "an indication of the general location" of the phone.
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