The Return of Barnabas?

Upon reading the account of Paul and Barnabas' separation in Acts 15:36-41, one would think that Barnabas was through with apostolic ministry. Cyprus was, after all, his home (Acts 4:36), and possibly John Mark's, since they were kin (Col. 4:10).  Reading through 1 Cor. 9, however, I was struck by a sudden reference to Barnabas therein (v. 6).  The way the passage is worded, it's clear that the Corinthians knew who Barnabas was.  Perhaps he joined Paul there at some point in Acts 18:1-8, or between Acts 17:31 and 18:1, and ministered to the Corinthians, which seems to be the tenor of the passage.  If that is the case, then Paul and Barnabas are reunited, though there's no further record of Barnabas in Acts.  To me, it would be wonderful if Barnabas and John Mark both got a second shot at the ministry.  It looks like both of them may have, especially John Mark (Col. 4:10, 2 Tim. 4:11).  God being the God of the second chance, and third, and the fourth...I wouldn't be surprised at all.

1 Peter 5:10-11  But the God of all grace, who hath called us unto his eternal glory by Christ Jesus, after that ye have suffered a while, make you perfect, stablish, strengthen, settle you.  To him be glory and dominion for ever and ever.  Amen.