When you use the second effect to tribute your monster... why can't you chain it with michizure?
Because you are ugly and nobody loves you.
Both of these answers are incorrect. When you tribute a monster to activate the second effect of E-Con, the last thing that happens is control of a monster switches sides. This misses the timing of your monster being sent from the field to your graveyard, so Michizure cannot be activated. If you were to tribute your monster as the last thing to happen in the chain (for instance, through an opponent's "Share the Pain"), you could activate Michizure in response.
No this is misleading, Michizure only can active when your monster is DESTROYED, not TRIBUTE. Destroy and tribute is two different things.
Because Michizure can only be activated in the Damage Step. You can't activate Enemy Controller in the Damage Step