Barnes never played any minnows
In 1911 SA played 3 tests, lost two and winning on on day 6 by 38 runs. The two losses were by 7 wickets and then by 530 runs.
In 1912 they played 6 matches, drawing one and loosing 5. Again by margins of 10 wickets, 10 wickets, 174 runs, an innings and 62 runs and an innings and 88 runs.
In 1913 they played 2 matches loosing both. Both by an innings, with the academic totals of 12 and 157 runs.
Finally in 1914 they played 3, loosing two and one draw. The two they lost were by 10 wickets and 91 runs.
They weren't anything other than minnow level, the same way the WI is now.
They were going through a lot of chances and most of the batting line up in those latter years were on debut series with no performances of note.
We could go though some of the names if you like.
They were minnows, or a decent team going through a minnow phase / transition.