Yeah, I understand the logic from the investors point of view of waiting to pick us up from an administrator. It's still a terrible outcome from the point of view of any supporter wanting to watch semi-decent Premier League football at the new stadium in the next few years.
These investors circling may be more credible than 777, their strategy may (from the point of view of their own investment) be sensible, but we should not confuse that with necessarily being the best thing for the football team or us fans thereof. It's also a pretty major asterisk to be applied when we are told by those "in the know" that their are other parties out there- if they are waiting for administration they aren't exactly the white knights some might perceive.
Indeed if the league do believe the alternative scenario plays out as you say it may well be the reason 777 have not yet been rejected, as the league do not want to be perceived as driving a club into administration. Which goes back to my point, that if there were investors willing to buy from Moshiri rather than from administrators they should identify themselves so the league are comfortable rejecting 777. If there are no such investors then it's a very unpalatable choice either way!