Let us put this 'all win yet loss' theory into practice...
If there is only 1 round of fixtures (ie. each team versus each other team once only.)
Win = 4pts
Loss = 0pts
Bonus Points = 1pt
5 games a season...
Team A wins all 5 games but gets no bonus points.
Team B wins four games, gets the bonus point in all four but loses against Team A.
Points
Team A - 20pts
Team B - 20pts
So it would come down to NRR.
10 games in a season would be the same except Team B would have to win the 8 games with the BP. While Team A only 'scrape' through their 10 wins. BLOODY RARE!
The bonus point is more for ordering the teams in a league this size (6 teams), as one or two teams will dominate...
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In a four division competition there should be one of two things, Pura Cup style or Bonus Point style.
PURA CUP...
Win Outright - 6pts
Win First Innings - 2pts
Easy & Simple, except that multiple teams could end up on same points
BONUS POINT STYLE...
BONUS POINTS
A Run - 0.01pts
A Wicket - 0.20pts
FIRST INNINGS RESULTS
Win - 6
Loss - 0
Tie - 3
OUTRIGHT RESULTS
An Outright Win after 1st Inngs Win - 12
An Outright Win after 1st Inngs Loss - 9
An Outright Win after 1st Inngs Tie - 9
An Outright Loss after 1st Inngs Win - 3
An Outright Loss after 1st Inngs Loss - 0
An Outright Loss after 1st Inngs Tie - 3
An Outright Tie after 1st Inngs Win - 9
An Outright Tie after 1st Inngs Tie - 6
An Outright Tie after 1st Inngs Loss -3
OTHER
Forfeit Win - 9
Forfeit Loss - (-6)
Complex but teams will never score the same (you'd hope)