Tuesday is a day of double significance for Leyton Orient. In the evening they look to extend their 100% start to the League One campaign by beating Notts County at Brisbane Road for a seventh win. Earlier their chairman, Barry Hearn, will be fighting for the club's very survival at a judicial review into the process by which West Ham United were granted exclusive football use of the Olympic Stadium. Orient are in a corner, less than half a mile from the Park entrance, but no one fights a corner harder than Hearn; and his team are showing the same characteristics.

They had to on Saturday to suppress Port Vale 3-2. The Valiants scored first after 20 minutes through Louis Dodds, equalised through Jennison Myrie-Williams within 10 of the resumption, after Orient had gone ahead in first-half added time, and hit the bar with a free-kick before Orient's 88th-minute winner. Micky Adams, Vale's manager, not unreasonably thought they were "worthy of a point" but admitted "defensive frailties let us down".

There is no room for those against the O's at present. Only Chris Neal's fingertips stopped them going behind early as David Mooney – from the same stable, Cork City, as Shane Long and Kevin Doyle – showed his brimming confidence with a controlled spin and shot slung to the far top corner. His thumping volley instantly equalised Vale's opener and Romain Vincelot, hounding the ball off Chris Robertson, had no hesitation in picking out Mooney's run for the second goal, too, when he himself might have shot. It was Mooney's seventh in six games. It was a measure of Vincelot's influence that he was man of the match.

Both Vale goals betrayed a prolonged failure to clear – Russell Slade, the manager, admitted as much – but Nathan Clarke showed his mettle in central defence and Elliot Omozusi was a consistently incisive interceptor at left-back. It was left to Kevin Lisbie to keep the Orient express on track. Receiving 30 yards from goal, he surged forward, like a towed caravan in high wind, before hitting the winner.

"Everyone got their rewards for pulling together," Slade said. He is unusual in his job in not having been a player, turning to it from teaching 20 years ago, and after three years with Orient he is the seventh longest-serving manager in 92. His squad is small but virtually free from injury. Nine of Saturday's starting XI have started all six league games and the other two five. They rose from 15th in February to end seventh and are carrying on. Perhaps Roy Hodgson, needing two wins next month, should tap in or hand over. The Slade school of fine art spells Light Ages.

Promotion is Hearn's thing – boxing, snooker, darts – but he has only one with Orient in 18 years, in 2006. He saved them in 1995, which is why he does not want them to go to the wall now. The estimate is that, if there can be no ground share with West Ham, they will be non-league in five years – so much for Olympic legacy.

He has championed financial fair play and on Saturday reminded fans that "60p in every pound spent with us we can give to Russell to build the squad". A crowd 900 up on last year's 4,000 average rewarded him. He also urged fans to "shout from the rooftops that now more than ever is a time to be proud to be an Orient fan". With tower blocks of flats, initiated by him, at each corner of the ground, the rooftops are high and the cries should reach the Olympic Stadium. After years of Hearn but not seed, something is growing at Orient that may end up in the Championship with serious investment promised.