Just a note on how BE may have come on to the radar.
Once a DNA link had been made between the CSK and the attack in 1988 using DNA recovered from the Kimono, all the police had to do at that point was to solve the 1988 break and enter and indecent assault. This would give them CSK. So the WAPOL threw all of the resources of Macro at the 1988 case. That amount of resources and modern investigative techniques combined with the evidence already gathered from the initial investigation might have been enough to solve the case quite quickly.
We do not know the details of that case, but it is possible that there was already some evidence suggesting that BE was involved. Talking hypothetically here, maybe a big party had taken place in a neighbouring street with a lot of people at it. Maybe police had identified 20 young men at that party. Maybe half had no alibi. Hitting a brick wall Police couldn't go any further than that list of 10 men since all denied involvement and had no priors. Remember that WAPOL had no access to DNA testing back then.
From this kind of hypothetical, it is not hard to see how things could have snowballed pretty quickly. It all depends on what Macro was able to do with existing evidence and investigations from the 1988 case. BE was from the Gosnells area, or at least schooled there. Gosnells and Huntingdale are neighbouring suburbs. It's completely possible he was already on the radar for the Huntingdale crime.