So, the Mika career so far asI remember it.
In 2008 he was one of the best players in the Warriors under 20s with a reputation as a fearsome defender.
In 2009 he was the big junior recruitment for the Newcastle Knights and played many roles in the Knights under 20s, including games as a playmaking 5/8 (he wasn't as good as he thought he was).
In 2010 he joined the senior squad and played some good games in firstgrade, including a few in the starting team. At the end of the season he had a leg injury i think, which meant he took virtually no part in the off season.
In 2011 he played in the last pre season trial, which was basically the reserve graders against some local players, and he was so unfit he was owned by the local guys. As the season went on he improved to the point he was selected for NSW residents (basically the best players in the NSW cup who aren't getting any firstgrade games) and played against Qld residents. When Wayne Bennett was appointed coach for next season it became obvious he wasn't wanted for next year, but to his credit he picked up his game another notch and was playing his heart out in the reserves.
I'd say he is now fully fit and in career best form. An off season under Sandercock would see him up to NRL starting standard IMO, since he was near that standard before missing the last off season, so I think you have a bargain.