The death of Phoebe Hogg was certainly precipitated by a frenzied attack, leading to a crushed skull and a near-decapitation. However, although this killing was fuelled by deep jealousy and hatred, Eleanor Pearcey did not possess gigantic strength. She didn't work at a menial profession which built up muscle power. She was kept by a sugar daddy called Crittenden.
My points still remain. Males were seen with three of JTR's victims shortly before their deaths. Stride was attacked by a male before death. I don't believe in a Jill the Ripper, entertaining though the theory is.