"We gave ourselves the chance and didn't take it, and that's frustrating."
Rutene was quick to emphasise, however, that he and assistant coach Paddy Gough never had any reason to question their players' commitment.
"They were a great bunch to work with, the team spirit was outstanding and they had a strong desire to do well, both for themselves and their union," he said. "Nobody felt the losses more than they did, I can guarantee that."
Rutene saw one of Wairarapa-Bush's main attributes was the stern competition for starting places, with all of the squad pressing hard for places each week.
"We never had any worries about weakening the team effort through subs being made ... we could go to the reserves' bench and know they would make an impact. It's a good position for any coach to be in."
Turning over ball in contact situations had been one aspect of Wairarapa-Bush's play which was too often a problem, Rutene conceded.
"A lot of it had to do with body position. We'd go in high and either lose the ball or be held up," he said.
"It's the sort of thing you can get away with in club rugby but not at the higher level, the old heads are quick to pounce there."
Rutene was also aware that while Wairarapa-Bush picked up bonus points for scoring four or more tries in about half their Heartland games, virtually none of them had stemmed from set-piece play.
"We seemed to find it difficult to strike from the set pieces, the bulk of our tries came after the ball had been worked through at least three or four phases."
Rutene was fulsome in his praise of the support his squad received from the sidelines, saying it compared more than favourably with the backing the other Heartland teams enjoyed.
"Our supporters were fantastic, there wasn't a game when they weren't there in good numbers, and the guys really appreciated that."
Rutene has yet to decide whether he will seek the head coach position for the 2014 season, but does admit to a feeling of "unfinished business" after twice taking Wairarapa-Bush to the Meads Cup semis and failing to advance beyond that.
"I think it's best to say I'll give it serious consideration and leave it at that," Rutene said.