It would be an almost impossible situation for the full output of the alternator to attempt to go to the battery, as its first duty is to supply current to whatever accessories are being operated- - - -lights, ignition, heater blower, etc. Then whatever is left over is routed to the battery for recharging after the starting load is applied. The high-current surge is usually only there for a matter of a couple of minutes, maximum. Theory is fine- - - -practical experience is better.
Jerry
