Definitely.
Obviously his only known murder victim was Shirley Banks. We can sort of guess at how it played out based on his failed attempt to abduct Julia Holman the night before, but we can’t be certain of everything. And we can’t be certain of anything in the Lamplugh case.
The similarities in terms of the victims’ profiles are obvious but it’s far from certain imo that there are any similarities in the MO. And the more convoluted the theory becomes in the Lamplugh case the less similar the crimes seem to me. Throw in the Sandra Court murder, which if the perpetrator was a stranger to her then it was almost certainly an opportunistic crime, and the waters become even muddier.
Cannan didn’t play the long game, if he planned his attacks in advance then he evidently didn’t spend a lot of time thinking things through. But let’s imagine he’s been setting Suzy up for a while - no one ever sees them together? Where did they meet? They must have gone somewhere together at some point? No one in her many circles recognised Cannan at all? BW supposedly sees them on the day she’s killed - where were they hanging out prior to this? Whatever they were doing they were doing on the QT, Suzy doesn’t even appear to have any contact details for the bloke, or if she did police couldn’t fathom what they were looking at.
Then suddenly on the day of the murder, a day when if the killing was planned you’d think you’d definitely want to maintain that low profile, they’re apparently being spotted here there and everywhere, including by one woman who knew Suzy well. It doesn’t make a lot of sense. And maybe in a certain way that *does* point to Cannan being Kipper, given how imperfect his other crimes clearly were - but it still feels a clunky fit to me.