Solving this by delivering a lot more forfeits is one way, but so far I've tried to stay away from that as much as possible...
To quote myself, this could sometimes be needed to discourage an unwanted behavior, to make league fair for all, and also to make league more manageable in terms of Commissioner duties (restrict the need of being around at exact given times, to prove if something did exist/happen, or whether it didn't).
However, I believe we already would've had one (more) forfeit last Season, should we have been implementing a clear, strict rule with that (and surely more would be coming in future Seasons, given that often times history is the best predictor of likelyhood of future events). Having said that, I don't say implementing stricter rules on this would be bad thing, but we just need to find a proper balance, and figure out how to solve this so that there aren't word against word-situations.
While "clear as a day"-sort of rule set (including penalties) hasn't been yet determined for this exact case (for previously mentioned, good reasons), I think it's necessary for me to say this now:
As it's now 3.30PM EET, and HGL Season 3 First Round Playoff matches have started, and neither of ED or SUM have provided a match link, I have an unfortunate obligation/duty to inform that Elan Demars (ED) will be given "a free ticket" to Second Round of Season 3 Playoffs due to SUM being handed a 0-50 forfeit loss in their First Round match against ED on Season 3 Playoffs. This is because in this case it's easy to determine, that it's due to SUM not being logged in since 5th of December. Yes, I couldn´t prove that ED had sent a challenge (for the record though, I believe he has, just as he said he had done). However, as we can see, even that is irrelevant in this decision, as match couldn't have been accepted by SUM due to not logging in, so this is the ultimate reason for this decision.
I know these are never nice decisions, especially given the fact that I mentioned, that I've been writing with SUM manager throughout these HGL seasons and he seems like a very good, friendly, and considerate person. We need to remember, that while this would've been the most important match of his Season, and while I have been "complaining" about consequences of this unorganized match, it´s not the end of the world (and we don't know what's happening in anyones´ life at any given time), and after end of the day, Buzzerbeater is just a game and real life is something that matters most.
Having said that doesn't of course mean that I'd downplay the importance of BB and HGL, they are important to me as well just as I'm sure they're important to many of us HGL managers, but it's good to keep the big picture in mind when discussing BB/HGL related topics, when considering what's genuinely important and what's not.
There's no doubt in my mind, that conversation over this (possible rule change, and different aspects that are related to it) will be continued...