Implying that it is talking about strength is also an agenda, since the first Right Hand we got to know more about (King) is known as someone who hypes his Captain's strength more than anyone else in the crew. Thats what most Right Hands do to be honest.
Thats why it makes much more sense for him to be comparable to Shanks in authority, personality, inteligence and charisma.
Then Shanks stops Akainu's punch, Beckman tries to stop Kizaru, Kizaru than acts ironic and doesn't give a shit about Beckman afterwards, then Beckmann is shown with a shocked face looking at Kizaru destroying everything with lasers.
All Admirals at Marineford respected Shank's presence and reasonings (again, Beckman might be equally respected, not equally strong)
Thats why the fact he is comparable to Shanks doesn't necessarily means strength, being feared by "powerful warriors" just means he is one of the strongest Commanders out there, there a lot of powerful warriors on Younko's crews, Commanders the best example.
Katakuri is equally feared or even more feared than Beckmann, Rayleigh himself hyped Adv.CoO that manages to see the future, he is stated as someone who "never lost", he is indeed one of these powerful warriors
Do you think this is enough to put Kata as the strongest Commander out there? Personally i don't think so.