Zadina's signing with the San Jose Sharks deprived the Bruins of a promising addition to their lineup.
Sweeney aimed to sign veterans to low-risk contracts to bridge the cap space until next summer but failing to secure these players questions the effectiveness of this approach.
The Bruins will rely on their veteran signings, but the absence of Ekman-Larsson, Wheeler, and Zadina will be felt as the team faces the upcoming challenges.