"For he who is not against us is on our side." Mark 9:40
Let me ask you Scott, do you think that applies today, or was it time sensitive? The context of the statement was that this individual was doing right, but he was not following the Christ along with the rest of them. Why did Jesus say this was acceptable, that he did not have to follow him at this time?
Jesus personally chose the 12 to be his followers, he came to God's people of whom numbered into the millions, yet only chose to be training and closely associating with them, for a reason I might add. The truth is, that man was very likely one of God's people under the law covenant as were Jesus and the 12, but the new covenant was not yet in force. If the person continued to pursue the faith on his own after the Christian congregation was formed, do you believe he would still be accepted? I would say the probability was very high that he was among those who received the holy spirit, but with the formation of the new faith, he would be expected to be among those in association with the congregation. Heb 10:24,25