There does appear to be another one. The burial was on 20 Jan 1807 (in Grouville), and the baptism is recorded as being on on 28 Mar 1807. Maybe the earlier one was his grandfather??
I've given this a bit more thought. The fact that there's no other record of the earlier baptisms of the three who were presented in 1818 may mean that the one who died in 1807 was another child whose baptism wasn't recorded.
A travelling pastor in more remote places only visiting a few times in a year and then when family are able to have a Church close by being 'received into that community'.
I'm not sure this would apply to Jersey. There are 12 ancient parishes in an island of about 45 square miles, and St Helier is the main town there. The Clergy Database doesn't have any evidence of a lack of clergy in St Helier at that time.
Incidentally, as well as the three who were received in 1818, I found the baptism of a John George Rose on 16 Jun 1816 to the same parents, also in St Helier. I wonder if at that time it came to light that the others' baptisms hadn't been recorded properly, and they came up with the idea of being "received" in order to get their names in the register and clarify their status as parishioners?
Alternatively, the marriage record (23 Dec 1800, St Helier) shows that Robert Richmond Rose, the father, was in the navy. Could the children have been born and baptised elsewhere while travelling, and then received after they settled down permanently?
Arthur