The scrum-half went over in the corner, finishing off Deiniol Jones' powerful break down the wing.
And Deiniol Tegid from Environment Agency Wales said they were "very concerned" about north Wales.
Two companies, Morbaine and Watkin Jones, joined together to form Deiniol Developments Ltd for the Bangor project.
"With Ian Evans injured we looked at Deiniol too who has been unlucky, " said Wales forwards coach Robin McBryde.
Number eight Gareth Delve starts just his second Test in Jones' place as lock Luke Charteris replaces Deiniol Jones.
The new Bangor post office will be at 264 High Street, some 260 yards (237m) from the current site in Deiniol Road.
Mark Watkins Jones, from Deiniol Developments, said contracts had been exchanged with Asda to provide a new store on the Farrar Road site.
Thomas' move and Alun Wyn Jones' absence following elbow surgery gives Deiniol Jones and Bradley Williams the chance to impress in the second-row.
BBC: Wales boss Gatland warns Martyn Williams and Ryan Jones
Gary Powell is out for up to eight months with a torn Achilles and they have also lost Gareth Williams (knee) and Deiniol Jones (rib).
The Blues lock, 22, scored the match-winning try for his side at Gloucester on Sunday, helping win him the Wales nod over Blues team-mate Deiniol Jones.
The introduction of prop Chris Horsman, for Booth, and lock Deiniol Jones, for namesake Ryan, bolstered the Warriors pack, which had been second best for much of the match.
Deiniol Jones picked up and drove and the Irish gave a way a penalty as they tried to slow down the big lock, Sweeney making no mistake with the kick.
There are two changes up front as Deiniol Jones takes over from injured Luke Charteris and in the front row Gethin Jenkins' absence (calf) gives Paul James a chance at loose-head prop.
Thomas' move into the back-row and Alun Wyn Jones' absence following elbow surgery gives Deiniol Jones and Bradley Williams the chance to impress in the second-row at the Millennium Stadium on Friday night.
The game was only four minutes old when Isaac Boss managed to spring through a gap between Deiniol Jones and Bradley Davies, and feed the supporting Jennings for the opening try which man-of-the-match Nacewa converted.
Deiniol Jones withdrew from Wales' Six Nations squad - joining fellow lock Lions star Alun Wyn Jones in Wales' treatment room - after injuring his ribs in the first-half of their 26-20 to France in Cardiff in Wales' last outing.
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