The 23-year-old came off the bench in the 19-12 loss to the host nation but then aggravated his ankle issue and was a late withdrawal from the bonus-point win over Russian Federation.
Japan's extras mean Scotland could take maximum points from their final two Pool A clashes against Russian Federation - who they face on Wednesday - and the Brave Blossoms and still crash out if the hosts were to secure two losing bonus points of their own. It's something that has not been refereed and there's been an agreement that there is more latitude for scrum-halves putting the ball in because you are the team that's won the scrum. "We'll see what comes of that".
"So it was obviously annoying to miss out on game time but thankfully it was nothing serious".
Scotland's fate remains in the balance but they could yet be given a helping hand from Mother Nature.
Japan's thrilling victory over Samoa in the World Cup last weekend drew in the host country's biggest-ever, single-market television audience.
The agency says Hagibis developed rapidly in 24 hours into what USA weather officials call a super-typhoon.
Any games cancelled at the World Cup because of weather are registered as scoreless draws - something which could allow Scotland to go ahead of Ireland in the Pool with wins over both Russian Federation and Japan.More news: Saturn Surpasses Jupiter as Planet with Most Moons
More news: Beckham fined $14K for dustup with Ravens CB
More news: Trump to sign US-Japan trade deal that benefits farmers
But Townsend insists his side will have to get to the knock-out stages under their own steam regardless of the weather situation.
"It's something that's always a possibility throughout this month in this part of the world".
"It was the same for the week leading up to the Scotland game really and I think we dealt with the conditions well that week, so we're versatile like that".
Organisers also issued a warning about Tropical Storm Tapah, that threatened to upset the first weekend's matches although it had little impact and all the games went ahead as planned. If it can not be played that day then it's two points for each team.
Players, too, seem unconcerned at present. "Fans are advised to monitor official Rugby World Cup channels for any updates". As such, it is thought no decision on Ireland v Samoa would be taken until 48 hours before the game.
Townsend has made 14 changes to the side which thrashed Samoa last week after deciding to hold the majority of his top stars in reserve for the Japan clash. I didn't want to do anything silly as well: "maybe they could have got the ball back and taken the bonus-point away from us". Joe Schmidt's defence coach Andy Farrell said, "the boys haven't even spoken about it - we just go from day to day, get on with our preparations".