"Yes, Elektra became a part of the WEA clusterfuck"
Actually, Elektra was always part of WEA. Warner/Elektra/Atlantic...get it?
"It never made much sense to me that Elektra still plugged AC/DC, Pantera, and Metallica but wouldn't touch Stomp 442"
While I actually agree with you about 'Stomp 442' (gasp!), I'd say they stuck with artists who had a bigger history with the label. Anthrax was only on their second album with Elektra, and metal wasn't exactly the biggest thing going at the time. But, Metallica, AC/DC and Pantera were pretty much guaranteed to sell a million records out of the gate.