[Tezcatlipoca]

I guess he let her go before as he didn't know who she was working for, & as he was only just getting started on being bad... early days of his "hunger".

By the time he tried (& failed) to take her power, he'd have known full well who she really was & worked for, plus he'd been killing people for quite some time so his "hunger" was probably stronger.

Mr African Isaac... dunno, guess he doesn't paint everything. We also don't know the extent of Arthur's powers.