Romans 5:17
Notice that the verse doesn't say that one will personally reign in life. It says that the gift of righteousness will reign in life..
You might want to re-read it.
much more
those who receive abundance of grace and of the
gift of
righteousness will reign in life through the One, Jesus Christ.).
The subject of the sentence is 'those who receive'.
That stands when you read the verse contextually.
Romans 5:15 But the free gift
is not like the offense. For if by the one man’s offense many died, much more the grace of God and the gift by the grace of the one Man, Jesus Christ, abounded to many. 16 And the gift
is not like
that which came through the one who sinned. For the judgment
which came from one
offense resulted in condemnation, but the free gift
which came from many ]offenses
resulted in justification. 17 For if by the one man’s offense death reigned through the one, much more those who receive abundance of grace and of the gift of righteousness will reign in life through the One, Jesus Christ.)
18 Therefore, as through one man’s offense
judgment came to all men, resulting in condemnation, even so through one Man’s righteous act
the free gift came to all men, resulting in justification of life. 19 For as by one man’s disobedience many were made sinners, so also by one Man’s obedience many will be made righteous.