Just some stats of all the categories and their best contestant placing per season. Interesting to note a boy has made the top 3 every year ... So maybe Matt is safe

Top Girls per Season
1. Cassie (5th)
2. Chenai (9th)
3. Leona (1st)
4. Alisha (7th)
5. Alexandra (1st)
6. Stacey (3rd)
7. Rebecca (2nd)
8. Amelia (3rd)
9. Ella (6th)
10. Tamera (5th)
11. Lauren P (4th)
12. Louisa (1st)
13. Emily (TBC)

Top boys per season:
1. Tabby (3rd)
2. Shayne (1st)
3. Ray (2nd)
4. Leon (1st)
5. Eoghan (3rd)
6. Joe (1st)
7. Matt C (1st)
8. Marcus (2nd)
9. James (1st)
10. Nicholas M (2nd)
11. Andrea (3rd)
12. Che (3rd)
13. TBC MATT T / RYAN

Top overs per season
1. Steve (1st)
2. Andy A (2nd)
3. Ben M (3rd)
4. Niki (4th)
5. Ruth (5th)
6. Olly (2nd)
7. Mary (5th)
8. Kitty (7th)
9. Christopher (3rd)
10. Sam B (1st)
11. Ben H (1st)
12. Anton (6th)
13 TBC SAARA / HONEY G

top groups per season
1. G4 (2nd)
2. Journey south (3rd)
3. Macdonald bros (4th)
4. Same difference (3rd)
5. JLS (2nd)
6. Jedward (6th)
7. One direction (3rd)
8. Little mix (1st)
9. Union j (4th)
10. Rough copy (4th)
11. Stereo kicks (5th)
12. Reggie n bollie (2nd )
13. 5 after midnight (TBC)

The Boys do seem to be the category most likely to make the Final

In 2007 there were two (Leon and Rhydian), 2012 James and Jahmene and 2013 Nicholas and Luke