Maybe we don't know as much as we think we do! Have a look at this, from Charlotte Zeepvat's Romanov Autumn (the underlining is mine):
One of the most enigmatic figures, and the most intimately involved with Alexei, was the sailor Derevenko. Anna Virubova claimed to have seen Derevenko bullying Alexei, shouting orders at a boy too bemused to fight back. If this is true it would have been a shattering experience, but its truth is not so clear cut as it may seem. According to Anna, it happened on 20 March, two days before her own arrest. After a display like that the sailor would surely have left or been made to go, but he was still at the palace months later. Shortly before the move to Tobolsk in August he submitted an invoice for new clothes and shoes for Alexei to Colonel Kobilinski, the commandant of the palace garrison. He was asking a huge amount, so payment was withheld: when the sailor complained to the Tsaritsa and she intervened on his behalf, Kobilinski showed her the invoice. She took the Colonel's part. Derevenko was refused permission to accompany the family to Tobolsk, but months after their departure, he was still pleading to be allowed to join them. Failing that, he asked for the return of a trunk, which he said had gone to Tobolsk in error. It was found and opend, and inside were the new clothes and shoes, and an icon given to Alexei by his great-uncle, Grand Prince Sergei Alexandrovich. Was Derevenko stealing? Looking after the boy's interests in his own peculiar way? No one will ever know.