XCOM2 *spoilers* After Skulljacking a Codex idea

[Joshuahoeth]

So the way I thought the game would handle this was that an Avatar would spawn after Skulljacking the Codex, then from that point on Avatars would spawn rarely on missions much like Codices do after Skulljacking an Officier, sadly this is not the way it works, so I am proposing that after one Skulljacks a Codex rarely an Avatar can spawn on following missions, but perhaps limit it to one Avatar a mission, how hard would this be to do and what are everyone's thoughts