The Dragons though showed intent from the off and claimed the first points through Jason Tovey's straightforward penalty.
Tovey converted well from the touch-line, the full-back and McFadden exchanging penalties after the break.
Mr Tovey dedicated the award to Guide Dog Mobility Instructor, Emma Yard, who trained the two to work together.
BBC: Guide Dog of the Year pulls owner out of 'living nightmare'
Warwick nudged Munster ahead before Tovey struck an upright with his first penalty.
The Wales star fell awkwardly after a tackle by the Dragons' Jason Tovey in Wednesday's 26-12 Magners League win.
Afterwards Mr Casey saw red marks on Mr Tovey's neck, who by this time was uncommunicative and appeared subdued.
Tovey sent his conversion against the upright to make it 8-3, before Flanagan sent a second penalty wide at the other end.
The talented fly-half's take-and-give with Aled Brew then sent skipper Smith over for a superb score that Tovey himself converted.
Dragons fly-half Jason Tovey kicked a penalty as the second-half came to a close to leave the contest finely balance.
Jason Tovey kicked three penalties in the first half and another in the second while Steve Jones scored a try.
Tovey converted to round off an excellent first half for Paul Turner's side who went in with a 21-10 lead.
Jamie Roberts, Leigh Halfpenny, Dan Evans, Martyn Thomas and Jason Tovey are other potential candidates, with Morgan Stoddart still injured.
Flanagan converted, but the Ospreys' lead lasted just a minute as Tovey kicked another three points after winning a penalty at the breakdown.
Steve Kefu sent in David Lemi after the break, while the Dragons lost Nigel Hall, Phil Price and Tovey to injury.
Russell Tovey and Sarah Solemani also won the comedy performance award for their roles in BBC Three comedy Him and Her.
Both sides showed an eagerness to attack but early penalties prevented any momentum being built up as Warwick and Tovey traded blows.
In another scene caught by the undercover journalist, Gardiner grabbed Mr Tovey by the neck and aggressively pushed him towards a door.
Jason Tovey knocked over a penalty as Leinster led 17-3 at half-time.
Tovey then moved the Dragons 9-6 ahead with two well-struck efforts as the likes of Joe Bearman and Toby Faletau made the hard yards.
Now the partnership has renewed Mr Tovey's hope for the future and he is trying to get into a college in Hereford for visually impaired people.
BBC: Guide Dog of the Year pulls owner out of 'living nightmare'
Tovey seized the chance and the full-back send a huge drop-goal over from the halfway line to give the Dragons a 13-3 lead at the break.
The Blues were unable to make headway and coughed up a penalty on the halfway line, but Jason Tovey was unable to convert the long-range kick.
Horgan and Isaac Boss added further tries for the home side after the break while Tovey kicked his second penalty of the game for the visitors.
Tom Riley sparked the move which eventually let in scrum-half Evans to claim the visitors' second try of the night, which Tovey converted and they held on for the victory.
Ashley Smith's fine try and the boot of Jason Tovey gave Dragons an early 10-0 lead, before Ben Jacobs's disputed try and Dave Walder's boot got Wasps going.
Arlidge floated a delightful pass to Jason Tovey inside the Leinster 22, the full-back off-loading neatly to Fussell whose diving finish was enough to convince the video referee.
And it was not long before they claimed their first try thanks to Tovey's cross-field kick which saw Harries go over in the corner for an unconverted try.
The Dragons - playing at Cardiff City Stadium as their Rodney Parade home pitch was frozen - enjoyed an outstanding start, Tovey thumping over a first-minute penalty from 40m.
Before Dez, Mr Tovey admitted that he would not leave his flat unless he really had to, but nowadays he is woken by a hungry dog at 7:30 in the morning.
BBC: Guide Dog of the Year pulls owner out of 'living nightmare'
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