Closely related species often live together, although it is generally accepted that the most intense competition exists

Closely related species often live together, although it is generally accepted that the most intense competition exists between them. Explain why in these cases there is no complete displacement by one species of another. Does this contradict the competitive exclusion rule?

1) The crowding out does not occur for the following reasons: related species occupy different ecological niches in the same community (different food, method of obtaining food, activity at different times of the day);
2) excess resource;
3) the number of a stronger competitor is limited by the third type;
4) environmental conditions create equilibrium due to the fact that they become favorable for one or the other. Therefore, the lack of full crowding does not contradict the rule of competitive exclusion.