The longer this drags out, the Sabres are retaining 100% of Eichel's contract and getting nothing to help the team either on the ice or in the pipeline.
We are all just spit balling without knowing what the offers are.
The 50% retention talk is crazy. But like has been mentioned before, if retaining $1-2M per means that Colorado puts Newhook in a deal when Vegas won't include Krebs, Anaheim won't put Zegras or MacTavish on the table, and LA won't put Byfield or Turcotte in the deal, then you have to consider it.
I get preferring to take back contracts that will expire long before retention will. But, no option to maximize the return should be off the table if building the team for the long term is the goal.