.net Core Many to Many relationship - optimization

Question

I am trying to determine what would be the smartest way to accomplish this. I may be way way overthinking what I am trying to do, but here goes.
I have the following entities, simplified
public class Meet
{
public int Id { get; set; }
//various properties
public List<MeetComp> Competitors { get; set; }
}
public class Competitor
{
public int Id { get; set; }
// various properties
public List<MeetComp> Meets { get; set; }
[ForeignKey("GymManager")]
public int GymManagerId { get; set; }
public GymManager GymManager { get; set; }
}
public class GymManager
{
public int Id { get; set; }
//various properties
public List<Competitor> Competitors { get; set; }
}
public class MeetComp
{
public int Id { get; set; }
[ForeignKey("Competitor")]
public int CompetitorId { get; set; }
public Competitor Competitor { get; set; }
[ForeignKey("Meet")]
public int MeetId { get; set; }
public Meet Meet { get; set; }
}
So I am creating a razor page where I get a specific Gymmanager and load all the related competitors to display in a list, which I have working just fine.
However I need another list (on the same page) of the related competitors of the Gymmanager but also who have an entry in the "MeetComp" table by a specific meetid. So List #1 is all of my Competitors and List #2 is all of my Comptetitors that are registered for that Meet.
Would it be smarter to have EF pull the data I get the data the first time with a ThenInclude()? Then I write some logic to determine if they get added to list #2? or should I make another trip to the Database? Then if I do make another trip to the database is there an easy to way to query for the List of CompId's I already have?

Answer 1

So here's what I ended up doing is making another trip to the DB.
public async Task<IActionResult> GetRegisteredComps(List<int> Comps, int meetid)
{
if(Comps.Count == 0)
{
return Ok();
}
if(meetid == 0)
{
return BadRequest();
}
var query = _context.MeetsComps.Include(c => c.Competitor)
.AsQueryable();
query = query.Where(c => c.MeetId == meetid);
query = query.Where(c => Comps.Contains(c.CompetitorId));
var results = await query.ToListAsync();
return Ok(results);
}