Continuing on the theme of this post: https://abn397.wordpress.com/2022/11/16/century-on-test-debut-and-never-again-oct-2022/
Here we look at the cases of those who scored a century on Test debut but never made a fifty after that:

Note the special case of AG Ganteaume who scored a century in his only Test (in fact his only Test innings). Perhaps this list should also include RE Redmond who scored 107 and 56 in his only Test in 1973. However, his son AJ Redmond played 8 Tests with a top score of 83.
The longest spell of tolerance by the selectors was for van Zyl (12 Tests) and DR Smith (10).For India there was Pataudi Sr (3 Tests for India, all as captain) and Shodhan (also 3 Tests).
The highest scores here are by Kuruppu (201*) and Ibadulla (166) besides the first of these unfortunates C Bannerman (165*)