I think there is a route description there, but it's more of a suggestion rather than an enforced rule. The summits/check points for the FGR are:
1. Moot Hall -> Skiddaw
2. Bassenthwaite Church
3. Beck Wythop
4. Barf
5. Lord's Seat
6. Ullister Hill
7. Grisedale Pike
8. Hopegill Head
9. Sand Hill
10. Eel Crag/Crag Hill
11. Wandope
12. Whiteless Pike
13. Low Bank (why not Rannerdale Knotts? You have to pass right by the summit)
14. Hawse Point (Crummock Water)
15. Low Ling Crag
16. Mellbreak
17. Red Pike (Ennerdale)
18. High Stile
19. Horse Close (Buttermere)
20. Crag Wood
21. Robinson
22. Dale Head
23. High Spy
24. Catbells
25. Otterbield Bay (Derwentwater)
26. Otterbield Island
27. St Herbert's Island
28. Rampsholme Island
29. Calf Close Bay -> Moot Hall