The Sabres are deep at left wing, adding Jimmy Vesey and Marcus Johansson to a group that includes Jeff Skinner, Conor Sheary and Olofsson. On the right side, however, the team has a hole in its top six.
"We don't like to slot players because we think that limits what players are capable of achieving," Sexton said. "Rather what we say is, two years ago we finished 31st. Last year, we're a lottery team. Nobody should feel safe. So, you show us that you can play, and we'll put you in a spot to succeed."
On defense, the right side features Jokiharju, Rasmus Ristolainen, Brandon Montour and Colin Miller. There's also Zach Bogosian, who's recovering from offseason hip surgery.
"Same message for [the defense]. There's no locks or very few locks in our lineup. We have to get better, we're going to get better, we're focused on getting better," Sexton said. "And really, for the first time in our management regime's short time here, we have true competition everywhere. I know the veterans in Buffalo have recognized it. They've translated that to their preparation. I know the young kids in Rochester and others recognize it."
Asplund, selected No. 33 by the Sabres in the 2016 NHL Draft, had 41 points (10 goals, 31 assists) in 75 games with Rochester last season. The 21-year-old started slowly but came on in the second half, with 25 points (eight goals, 17 assists) in his final 29 games.
Sexton said he "worked his tail off" and made "great strides" over the past year.
"I just want to improve my game every day and get better every day. My goal is to play in the NHL, so I think it's been good for me," Asplund said. "I've been here for a week now and I've been on the ice with (Sabres center) Jack [Eichel] and all those NHL guys. It's been good for me to just feel the tempo and everything with how they play."
There's been an added emphasis on development since Jason Botterill became general manager on May 11, 2017, and the Sabres are hopeful they will reap the rewards and being an end to their eight-year Stanley Cup Playoff drought this season.
"Honest to goodness, there are no disappointments on the development side. None," Sexton said. "And the other thing, I think it's important to remember a couple things. No two players develop at exactly the same rate … So, we don't worry about day to day or even week to week; we just want to make sure that the trend is continuing up. Because we've been in this a long time, we know it's not a straight line to start."