I'd love nothing more than him establishing himself as our premium striker but you just need to look at all the strikers Moyes has brought in for a decent fee and they all have an instant impact but are ruined later on.
James Beattie scored 11 goals I guess in his first season, AJ scored 13 goals and was considered extremely hard working but was told to play on the wings next term and hence his goals dried up. Yakubu scored 22 ****ing goals in his debut season and he was never given a fair chance to prove himself after returning from his injury. He left for B'burn and scored 16 goals.
Stats show that Moyes and strikers don't work out well and so I won't believe that Jelavic is gonna be our main man for the next few years cos Moyes will end up trying to make his defensive game better and his goals will dry up as well.