To me, the simple, reasonable thing to conclude is that man can indeed thwart God's will (again, wrt salvation).
if you hold this in the context of God intending to redeem an individual, and that individual having the capability to frustrate God's intention, then do you imply the converse - that an individual who 'elects' redemption forces God's hand to save that individual, to the exclusion of God's own intention, such that even presupposing God's intention is to redeem all, that intention is superfluous because it is wholly enacted or brought to nothing contingent on the will & intention of the individual?