My opinion is this team is no where near built to contend. Way too young/soft currently for the playoffs, and that does not even take into account that the coach has stated that he has not yet had time to install his defensive system.
The Team PKs in the low 70%. As long as stats have been kept, I do not believe a team with a PK below 75% has ever made the playoffs. Those are bare minimum numbers needed to get in, and teams that contend have much better PKs.
Looking up and down the lineup, the only players I feel that are likely playing at their prime level still is Skinner and Lyubushkin, and Okposo and Gus are in decline, but none of them are going to be the stars that win the cup for this team. Tuch is maybe close to hitting his peak, but he is still learning how to play a better two-way game and PK. Thompson is an offensive monster, but he is greener than astroturf when it comes to knowing how to efficiently play center in the NHL. Even if his numbers drop off, and I fully expect them to as he embraces more responsibility defensively, he will likely be a better asset to the team as a more complete player.
Quinn and Peterka are just pups. They were manhandled in the regular season, and are so not ready for playoff hockey. This team will need those secondary guys to be more physically mature and stronger in every area on the ice.
All of the D, with the exception of Lyubushkin are still learning and developing. They will all improve.
Adding a top 4 defender will improve the team, but it doesn't vault them into contender status. Time and growth from within will be the main factor to do that, and when they are truly ready to compete, Adams is going to have to make some tough decisions to replace some of the softer talent with playoff grit, physicality and intensity. So, while everyone agrees that a top 4 D is needed to improve this group now, I personally feel that it is not yet dire, and they aren't losing cup window years yet without a big move. Adams needs to get that move right so I am alright if he doesn't just go after the best player available now. Rather see low cost stop gaps until there is a great fit worthy of a huge acquisition cost - that will probably change once their window opens if he has still failed to address those needs though.