I would argue that with our current roster before today at 15 players plus the 4 or 5 non roster players like Hepo that are realistically ready to come up to the NHL full time and about $20 million in cap space, that he would be more valuable to us now more than ever before. He's inexpensive and gives us a better chance to go after Panarin and Bob, rather than a "help now" player with a more than likely higher cap hit.
At the very least, our top 6(Huby, Barkov, Dady, Trocheck, Hoff, Vatrano) is already formidable. Plus Panarin, Borgstrom, Tippett, Hepo, and potentially resigning Malgin, Sheahan, Brouwer, Lammikko, Hawry, Haapala, etc... we have a very formidable forward group.
I doubt we could get a return for Hepo that would warrant top 6 or even top 9 minutes without also throwing in draft picks.
Having Hepo crack the opening night roster would help us now more than trading him away imo.