Joe Schmidt has said he will conduct a forensic review of Bundee Aki's red card before answering whether it was the right decision or not.
"We are happy with the result and a number of things about the performance, but we are obviously disappointed that we didn't finish the game with 15 players and we will look at that and come up with some reasoning behind it", said Schmidt in the wake of the seven-try performance that put Ireland into the quarter-finals and back on top of Pool A ahead of Japan's match on Sunday versus Samoa.
Best gave Ireland the start they were looking for when he touched down after four minutes as Samoa were forced back by a driving maul and they soon had a numerical advantage with Seilala Lam sin-binned for a hit on Jacob Stockdale.
"We can't control what happens with the Japan-Scotland game, so on Saturday it's up to us to get our business done as best we can", he said.
Joe Schmidt's team have rebounded well from their loss to Japan, keeping Russian Federation scoreless in a bonus-point success, although it was not quite as straightforward as the 35-0 scoreline suggested.
Aki, who is of Samoan descent, was red carded in the 29th minute for a risky high tackle on Ulupano Seuteni, leading with his shoulder in the flyhalf's face.
It made little difference to the contest, such was Ireland's domination in the forwards allied to the quick-thinking of Sexton and his halves partner Conor Murray.
They were converted by Sexton's replacement, Joey Carbery, who set up Conway's score with a neat grubber kick.
Backrower Jack Lam scored Samoa's only try, although both teams had a second-half try ruled out by TMO.
Ireland took just three minutes to cross for their first try, getting the driving mall going from a five-meter scrum before Best powered over the line. It was awarded after one of several video reviews.
Ireland have tried hard to detach themselves from the uncertainty caused by Typhoon Hagibis, especially when it became clear early in the week that the Kyushu region, where their match will take place, is likely to be spared.
The Six Nations side gained a man advantage when Australian referee Nic Berry sent Samoa hooker Seilala Lam to the sin bin for a risky tackle on Jacob Stockdale. Furlong broke four tackles, even going through one with an nearly ballet-like pirouette that is most irregular for a player of his imposing size. He believed Italy was disrespected, and went as far as saying the match would not have been cancelled if the defending champion All Blacks needed the points to reach the quarterfinals.
Murray was as composed as ever, combining brilliantly with Sexton and also displaying his quality with ball in hand and the boot before he was replaced just over 10 minutes into the second half.
After that, Ireland kept attacking and Samoa played nearly the entire second half camped in its own half. TJ Ioane, 6. Chris Vui, 5.
Skipper Rory Best said that the Irish had been mindful not to panic following Aki's premature exit.
But from the Samoans, it was sloppy, and they go home in next-to-last place having only beaten Russian Federation.