Tkachuk is already doing very well in the NHL at only 19 yrs of age, he's a kid. White is also doing very well in his first season on the roster & Chabot has elite offensive skill from the backend.
Now they have to hope that Brown, Batherson, Brannstrom, Formenton, Chlapik, Wolanin, Norris, Balcers & the high picks they have for the upcoming drafts also pan out as good to very good NHL players. They could use a couple of elite RWers in the next draft or two. Cozens or Dach would look good with Tkachuk & White, if PD could manage a way to get up that high in the 2019 draft. Brett Leason is an interesting RWer Ottawa should go after, if they end up close to where he will be selected. Much more likely they get their elite skilled players from the 2020 draft but you never know.
Right now with Columbus's first they have a shot at Lavoie C & with their two 2nds have a shot at Leason RW & Foote LW or Knight G in the 2019 draft. Could all be interesting players that make a difference especially in the playoffs where it counts the most at some point in the future.