I'm trying to put all 4 on bh but it is not unlocking him. Never change, Tam
The earliest Lv for Gold coaches to appear is 15 and Gold coaches may be unlocked until Lv 20. Now Neuwirth only requires 10 points in OBL but you must put
5-10 points into any other tree (doesn't matter which order, S&V or DBL) in order to make him available at Lv
15-20 because there's a special rule for Gold coaches who require less than 15 points overall (but will, of course, only become accessible once you reach Lv 15). In a nutshell, for Neuwirth requires 10 points in OBL before you reach Lv 15 (5 points elsewhere) or before you max out (6-10 points elsewhere). Putting 11 points or more into OBL
first guarantees that you won't ever see him.
Another example: Rabari, requires 13 points in OBL. In order to unlock him, you must put 2-7 points into any other tree before maxing out at lv 20. If you put 2 points into S&V or DBL and then 13 points into OBL, he will appear at Lv 15. If you put 7 points into any other tree besides OBL and then the remaining points (13) into OBL, he will appear at Lv 20. You cannot put 18 points into OBL first and then 2 points somewhere else to make him appear.
For any coach that requires 15-18 overall points to unlock, the order doesn't matter as long as the required points are put into the respective tree. For example Zajic (15 OBL), Quah (8 OBL, 8 DBL), Lum (5 in each), Welch (18 DBL).
BTW the same rule also applies for Silver coaches (available at Lv 8 ) and Bronze coaches (Lv 2). New Bronze coaches will stop appearing at Lv 8 (Silver coaches will "takes over") new Silver coaches will stop appearing at Lv 15 (Gold coaches will "take over").
The elusive Platinum coaches will only appear at Lv 21.