By absolute power God could have made man mortal in body; Adam could die in the divided sense, not the composite
He says, however, that all this must be understood of the order God once established. "If we speak of God's absolute power," he says, "there is no doubt that as Lord of all creation he could, without wronging it, have so made human nature that, although man kept his innocence in his soul, in the condition of his body he would have been like the brute animals, subject to death and the rest no less than they are."
So, although Adam in the state of innocence could sin and through sin become subject to death, and in that sense (the divided sense) it is true that unfallen Adam could die, Estius insists that the same statement is false in the composite sense, because he could not die as long as he kept his innocence.
Latin
X. Haec tamen intelligenda dicit juxta ordinem semel institutum. Nam, inquit, si de absoluta Dei potentia loquamur, non dubium quin ita potuerit humanam naturam, absque ulla ejus injuria, tanquam totius creaturae Dominus instituere, ut licet homo in anima conservaret innocentiam, corporis tamen conditione brutis animalibus similis esset, morti caeterisque non minus quam illa obnoxius. Itaque licet Adam in statu innocentiae peccare potuerit, & per peccatum morti fieri obnoxius, & sic verum sit in sensu diviso Adamum integrum potuisse mori, pertendit tamen idem falsum esse in sensu conjuncto, quia mori non poterat, quamdiu servaret innocentiam.