ananda was a sotapanna while the buddha was alive he became arahant after the death of the buddha
but he was perfecting his parmis so when the buddha died and he had time to practice he had reached a stage where he was ripened to attain arahantship.
at the time of the buddha the monks were aware of their own and others levels of attainment there is no ego involved, it is simply fact.
to become sotapanna is available to all who practice properly, all levels of enlightenment are available to all who wish to practice.