In Rayleigh's case, he had 2 of Teach's subbordinates while Gunko had nothing important to lose. Gaban had way more to lose than Rayleigh
Here Gaban had to choose between getting Colon killed (neck stabbing) vs surrendering and not fighting back, which gave Gunko the opening to stabbed him right away, and to fall off a huge tree on top of it. A desperate attempt but he is in the worst situation here. Also Gaban probably still gonna have a role in the arc, we can't say he is completely done
Gaban always had the biggest nerf because he could taken care everything by him self .
Unlike the other old legends who in context had help or certain things went there way .
Ray for eg did not save the SH they get save by kuma cause he had his hand full with Kizaru .
Then we find out that ray him self said he could not beat BB but because BB were crew hostages and he still get some things he want he made a deal .
Hell WB did not even directly save ace it was Mr 3 and luffy , garp going easy etc etc
Don't know why some would try compare them when it easy to see Gaban get deal the worst hand of all of them .