Those are mere hypothetical to explain the mental situation of two different persons with equal needs and every other necessities in place. Mr A feels comfortable and okay with an aggressive 25% allocation to bitcoin and that doesn't seem to bother him or give him a sence of over allocation to bitcoin whereas Mr B feels okay with his 10% whimpy investment despite knowing he could allocate more to bitcoin.
Another thing might be that Mr A and Mr B responsibilities are not the same, and Mr B have a high responsibility than Mr A which will make Mr B not to be able to invest 25% because that is more than his discretionary income. Another reason that is that Mr A might have a strong faith in bitcoin a d chose to buy aggressively using DCA method because he feels that this is the best opportunity for him to invest aggressively and increase his bitcoin faster. On the other hand Mr B might not have not have strong believe in bitcoin just like Mr A, and decided to invest only 10% of his income using DCA until he builds his believe and knowledge on bitcoin, he might decide to increase his amount.
The percentage of fund an individual can allocate to Bitcoin is really immaterial and if we want to work out a number for such, it will amount to a futile exercise. Individual responsibilities differs and there are no two person that have the same needs and the same responsibilities.
@JayJuanGee have helped a lot in explaining the important things to do as regard buying and holding Bitcoin. Such as using the DCA method while also making provisions for emergency funds. If we follow this process, every individual can easily work out what percentage of his funds to put into Bitcoin. How aggressive an investor should be depends on many other factors which I think should be topic for another day so we don't make it appear like competition.