Justin Edinburgh was the manager who led Orient back to the EFL, winning the National League title in 2018-19.
However, his sudden death aged 49 in June 2019 left a huge void at the east London club.
“We got that promotion and then we had the biggest kick in our guts of losing Justin,” Orient director of football Martin Ling told BBC Radio London.
“It was really tough to come back from that.
“None of us had the answers and no-one knew really what to do. We did everything we felt was right and we respect Justin because he was the one that started the ball rolling.
“You have to remember he was a big part of this [League Two success].”
Three mid-table finishes in League Two followed before Orient were able to mount a sustained – and ultimately successful – push for promotion.
Ling, who himself was Orient manager between 2003 and 2009, believes Wellens is the most similar boss to Edinburgh they have found since the untimely death of the former Tottenham defender.
“The best I can say is that Richie reminds me of a ‘northern Justin’,” he added.
“When I go over to the training ground there is the same buzz and drive over there. There is a real determination to work hard but also a smile on everyone’s face.
“It is a real good combination. Richie has been wonderful since he has been here and he won’t be one to settle in League One. He’ll want to do well.”
That challenge awaits Wellens, who has already managed in League One during spells at Oldham Athletic, Swindon and Doncaster Rovers.
However, the 43-year-old will always have the respect and gratitude of the Orient faithful for his exploits in returning Orient to the third tier – an achievement which sparked an outpouring of emotion from players, staff and supporters.
Interviews by BBC Radio London’s Phil Parry and Dave Victor.
