Those are actually good examples, even if I personally would probably call Shaw and Hawkins late bloomers since they already played chess at at least club level as teens. Never the less, it is interesting since it sounds like something clicked for Hawkins and he started rapidly to get better while Shaw is more of a slow and steady improvement over time. So both type of improvement are possible.
Suba is most interesting for late starters since he started playing as young adult. Is there any examples of his training regime or program? Did he played it beside his studies and work or did he 100% focused on chess?
Hawkins and Shaw were only class players by age 18 and went on to become GM's in their 30's.
Mihai Suba supposedly only learned to play at 19 so he may be the best example.
Jiangchuan should also count but he mastered a similar board game earlier so a lot of the spatial abilities one usually needs to develop for GM where well developed in him by another game in his youth. Doesnt make it less impressive but when it comes to being inspired by being a late blooming player, his example is not as useful.