As you would know, the suttas talk about the Path and Fruit of Stream Entry. As long as I did not know clearly the difference, then considering the qualities of a person at either stage would be quite useless. The also suttas seem to use different terms for Stream Enterers (SEs) and as long as I didn’t see why different terms were used, I assumed that they were interchangeable. My study indicates the first three fetters, as with the others, are gradually eradicated and this relates to the different terms used for SEs.
For me now, the one on the Path to Stream Entry, is at one of the first four steps mentioned above. One Attained to View, to me, is such a one and refers to the one who has heard the teaching and developed ‘verified confidence’, after associating, listening and reflecting, but has not yet tested the teaching (which is step 4 and which would convert Right View to Right Insight).
Once they have tested what they have heard and found it to be true in one lived experience, then they develop the Fruit of Stream Entry and the first taste of Right Insight, which saves them from lower births and makes them ‘endowed with virtues that are appealing to the noble ones: untorn, unbroken, unspotted, unsplattered, liberating, praised by the wise, untarnished, leading to concentration’.
One attained to view (on the path of SE) may not be able to do the six things, but with the deeper experience of the Dhamma, his ethics (morality) would expand to non-intentional killing of any human and the other aspects of ethics, which I think has been well maintained in the Bhikkhu Parajika rules. He may intentionally kill a mosquito, which is a lessor offence (and for me, not breaking ethics or morality).
Thus AN3.87 says, the SEs are perfect in ethics (does not break serious rules, but may break lessor rules), but only slightly accomplished in concentration and wisdom.