I think there was an implied question as to whether the odd-ball semp was the same or a different variety than the r-mahogany above. It is quite common to see no-id seedlings emerge in a pot or colony when the pot or colony is older. One will not notice a new seedling for whatever reason until it gets large enough to stand out. Thus it is likely that the odd one in the pot above is not a rubellum mahogany, but a stranger taking advantage of the opportunity to grow in a new home. To preserve the named variety, the odd ones should be moved to another home, imho, or weeded out.
