Erm... no - we don't even have to score, let alone match Cardiff's efforts. No silly scorelines are required either, in fact individually, each envisaged result is far more likely than Bournemouth were to win by 5 at the Amex.
If only you'd bothered to read the OP, then you could have avoided...
This would require us to revert to the form shown against Bournemouth, whilst Cardiff would need to recapture their performance against Chelsea, a match they would surely have won with VAR.
So, the nightmare scenario...
Cardiff 3 Palace 0, Arsenal 5 Albion 0.
Man Utd 0 Cardiff 0...