There have been plenty of highlights for the 25-year-old, such as winning the 2022 Brazilian Grand Prix and outscoring Hamilton in the same season, but Red Bull's dominance emerged just as he made the move.
We have therefore never seen the man from King's Lynn given the opportunity to properly compete for a world championship.
Brundle: Does Russell have mental resilience to be F1 champion?
And this is something that Brundle is unsure of as to how the Mercedes man will cope, after he was asked who between Russell and Hamilton is most likely to win a championship in the next two years.
"I think they're so close, those two, if you look at the stats, but George had a couple of nightmare races this year," Brundle told Sky Sports.
"It depends if Lewis maintains his current motivation, but it's so close to call.
"Lewis knows how to do that but George has got youth on his side. I don't know the answer to that, but I definitely wouldn't say, ‘oh, Lewis without a doubt, because he's already a seven-time champion.' That I would absolutely not say.
"Until George is in a championship winning position, we don't know if he's got the head to cope with it."
GPFans is a multi-platform, multi-language brand dedicated to Formula One coverage. We bring you all the ins and outs of the sport, 24/7, everything from up-to-the-minute news and features to the latest viral stories and clips.
We believe that a new generation of exciting, outspoken drivers will make F1 more popular than ever before, and we want to give our users access to as much of their heroes as possible, on and off the track. From Lewis Hamilton to Max Verstappen, Daniel Ricciardo to Sebastian Vettel, we provide in-depth analysis of every every Grand Prix in the season, from Australia to Abu Dhabi.
With Formula One under the new ownership of Liberty Media, how the sport is being covered is evolving, and GPFans will look to be at the heart of this progression into new media, as one of the fastest-growing sites covering the king of motorsports.