Regarding being a disciple and not being an apostle, in the first chapter of Acts, it is recorded there were 120 disciples gathered.
Act 1:15
And in those days Peter stood up in the midst of the disciples, and said, (the number of names together were about an hundred and twenty,)
So, it can be safe to estimate there were at least this many disciples during the final days of Jesus’s ministry. So, it’s entirely possible for Lazarus to be in this group and not be an apostle.
https://debatingchristianity.com/forum/viewtopic.php?p=957930#p957930