Provided players don't relocate across State Lines, I agree that the "Played NRC" issue is not really a big one for Colts 2016, but it should factor in Shute Shield Player Points Calculations.
NSW only had the following folk who will be Colts eligible in 2016 play one or more NRC games:
James
WILKINSON, Gordon Shute Shield, NSW. 2015 North Harbour Rays NRC (1 game off the bench. Carries Combined States 2014 points into 2016 with -2 points [max] loyalty discount).
Declan
MOORE, Sydney University, NSW. 2015 Sydney Stars NRC (3 games off the bench. Carries NSW II Schoolboys 2014 points into 2016 with with -2 points [max] loyalty discount).
Guy
PORTER, Sydney University, NSW. 2015 Sydney Stars NRC (2 starting games. Carries NSW I Schoolboys 2014 points into 2016 with with -1 point loyalty discount).
Theo
STRANG, Scots College, NSW. 2015 Sydney Stars NRC squad. (No NRC games & will arrive in Colts with Aust Schoolboys Player points. Assume this will be Uni. What will The Corporation do with Duffy (2014 Aust Schoolboy halfback)? - Grade to replace Gordon who is Tahs EPS or something?)
Additionally these young men found favour with other nations selectors in 2015, and are believed to be eligible for Australia in 2016:
Vunipola
FIFITA, Randwick, NSW, Tonga 2015 (Previous State U20 experience, and Aust Schoolboys player points)
Sam
TABUATAMATA, Gordon, NSW, Fiji 2015
Others in the "Born in 1996 or earlier" cohort, with experience at National U20 Championships include:
Ed
CRAIG, Eastwood, NSW (Previous Aust Schoolboys player points but has max loyalty discount as an Eastwood junior)
Francis
BROWN, Sydney University, NSW (Previous Aust Schoolboys A player points, but these were from 2013 so will "expire" in 2016 and he will be re-eligible for Colts 3 selection
)
Phil
BRADFORD - Wanderers, Newcastle, NSW (He is "unknown" to SRU competition, and seems comfortable in the Hunter competition. There are probably family, employment and/or study reasons why he has chosen to remain in the Hunter.)
Of the names mentioned above, not many will get much Colts 2016 time.
Wilkinson played most of the season 2015 in First Grade Run On, and was not out of place. I'd anticipate he will remain playing Grade, but will probably miss a few rounds due to U20 duties.
Moore played about 4 First Grade and a couple of 2nd Grade games, mostly off the bench. He is behind Fainga'a and Coolican at The Corporation, so may be doing a 1/2 Colts, 1/2 Grade season in 2016.
Porter was injured for most of 2015, fronting up from Team Rehab for the last few rounds of Colts. He has another 2 years of Colts eligibility ahead of him, and probably should spend at least the early rounds of 2016 in Colts (with some time doing the Summer 7's circuit as well).
Fifita played about 3 first Grade and 3 second Grade games for the Wicks. The Wicks stocks of Colts props is healthy and he will probably be in Grade when not on U20's duties.
Craig is behind Roach, Pearce and a couple of Ferris's at the Woodies and will be probably miss a few rounds due to U20 duties. His development would benefit from some more grade time (he got a couple of lower Grade games this year), but the Woodies tend not to push their Colts players into Shute Shield early.
Brown is a bit of an enigma. Made State U20s last year, and had a game or two with Grade at the Corporation but while being in and out of Team Rehab ended up in Colts 3's and 2's.
Bradford is unlikely to come under SRU (Colts or otherwise) jurisdiction in 2016, and therefore will not be subject to Player Points calculations.