Absolutely no offence to Prof here or the Alt PL Table (it's the thread that made me join the forum and want to post), but people really need to stop reading it so literally. Whether we are minus 4 or not is purely based on what methodology you use to target points. For example, I keep my own version of the Alt PL Table with a different target points distribution and we are on 0, with City on +2 and Chelsea on +3, with Utd on -5.
At the moment I'd say that the actual table is a pretty fair reflection of where we are to date, as all 3 of the title challengers have played each other twice. Now obviously in theory City have the advantage of playing both of us away, and we are the worst of the three in that respect, but points on the board are always preferable to an easier run of games coming up IMO. We've seen in recent seasons that any team can drop points to any other team in the PL.
At this stage of the season it is far too early to be calling any game 'must win' IMO. The season will have peaks and troughs, good runs and bad runs, and they'll be points dropped that we curse, and points won which are a bonus. We're unbeaten, we're scoring goals for fun (which was our main problem last season) and we have a crowd back at Anfield. Let's see where we all stand after 27 games rather than 7 games before we start declaring games 'must win'.