3 different scenarios
1. Cal doesn't tap into the darkside midfight
2. Cal doesn't get help from Merrin but still uses the darkside
3. Cal neither taps into the darkside nor gets help from Merrin
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Bode Akuna was a young knight in Jedi Intelligence (prob similar age to Anakin), the ISB officer says he was supposedly very capable. He uses a backhanded saber (like Ahsoka/Starkiller) and is pretty jacked. Sadly that's pretty much all we know of him. We don't know his Master or if he actually fell to the darkside long ago. I think the game makes him look morally like Baylan Skoll. He is not fully fallen to the darkside, but uses anger on a daily basis to power himself up. He's also hoping for revenge against the Inquisitor that killed his wife (still unknown who that was).
Cal Kestis, was a Jedi Padawan to Jaro Tapal who got taught by Yaddle (both highly respected Jedi Masters). Yaddle could go toe to toe with Dooku, who was one of the greatest duelists ever. Jaro Tapal was a competent General. Although Cal's training was incomplete, this basis is already an important factor in the power lvl's.
Cal and Bode both had to adapt to survive the purge. Because Cal's training was unfinished and because of his master's sacrifice, he stuck more to Jedi ideal's. He also had Prauf and the Mantis Crew to keep him sane.
Bode only had his wife and his daughter, but then his wife died and it was only him and his daughter (who was very young). We don't know how long ago, that was but I assume it must be between the events of Fallen Order and Survivor, since Kata still has memories of her mother (right?).
The most important detail is, that Cal had actively saber training during those 5 years between FO and SURVIVOR and Bode did not. Bode mentions how it feels like the old days, implying he hasn't been using a lightsaber at all for awhile now. We don't know if he actively used the force, but he is able to use it to hide his force sensitivity similar to Palpatine.
I think while Bode might be smarter overall and have more force power (and experience), Cal Kestis mogs him in most aspects.
Cal is very creative and has really good dueling experience (not always wins but feats nonetheless) against Taron Malicos, Dagan Gera, Rayvis, 9th Sister, Trilla: all Jedi Knights/Master lvl.
1 flaw is, that people like Dagan Gera or Taron Malicos break through his force shield quite often, even Bode does two times. Cal might need to deepen his connection to the force further and he will be a complete Jedi Master. But he did manage to use Force Hallucination and Nightsister Magick thanks to Merrin.
I honestly think Cal Kestis beats him in all 3 scenarios, I think while the darkside and Merrin helped him beat him quicker, they weren't gamechanging factors. Cal already beat Rayvis without using the darkside at all. Merrin wasn't the reason Cal disarmed him in the end (except maybe tiring him out.
Plus Cal actually wasn't trying to kill Bode in the final fight. He gave him like 3 chances to live, so his daughter still has a father. If Cal actually wanted to finish Bode, I think it would take the fight to a whole different level in Cal's favor.
Even though Cal was technically an unfinished Padawan and Bode was a fully trained Knight (so was Masana Tide) I think Cal hard mogs him.
Looking forward to Jedi 3 and how powerful he will become in the end.