Despite the three points lifting Leigh to third from bottom, below them were Toulouse, the franchise side who were exempt from relegation.
The French outfit lost 34-18 at title-chasing Halifax on Saturday, with Shad Royston keeping up his impressive run of form with two touchdowns.
Gateshead’s revival under Steve McCormack was completed on Sunday, as a 56-0 win at rock bottom Doncaster ensured safety. Paul Franze grabbed a hat-trick for the Thunder, who had a remarkable second half of the season to climb up the league ladder.
Other relegation-threatened side Batley won 30-26 at Featherstone. Paul Mennell scored twice for the Bulldogs, who saw off a late comeback from the home side to take the spoils and secure another season in the Championship.
On Thursday, Sheffield sealed a third place finish with a 29-22 defeat of Barrow, who played for a bonus point to finish the season on top of the pile.
In a surreal second half, the trailing Raiders persisted with kicking penalties and drop goals to draw close to the Eagles, before a late try and field goal from Craig Cook snatched the points for the home side.
In the Championship One, Rochdale defeated Workington 42-20, with Miller and Fogerty each crossing twice.
Hunslet saw off Oldham 36-18, as Wayne McHugh notched three scores. Dewsbury ended the season undefeated, seeing off plucky Blackpool away from home.
York will have high hopes of promotion after a final day 46-28 defeat of Swinton, a result which confirms the Knights in third place.