For your information:
The following is tested in training mode, and I start counting the frames from when Toon starts to grab, not when Jiggs/Bowser actually get grabbed.
Jiggs at 0%, Toon at 0%, no pummeling, no mashing, Jiggs breaks free on frame 102.
Jiggs at 0%, Toon at 50%, no pummeling, no mashing, Jiggs breaks free on frame 102.
Jiggs at 0%, Toon at 0%, Toon pummeling, no mashing, Jiggs breaks free on frame 102.
Jiggs at 0%, Toon at 50%, Toon pummeling, no mashing, Jiggs breaks free on frame 102.
Jiggs at 0%, Toon at 0%, no pummeling, Jiggs mashing every 2 frames, Jiggs breaks free on frame 31.
Jiggs at 0%, Toon at 50%, no pummeling, Jiggs mashing every 2 frames, Jiggs breaks free on frame 31.
Jiggs at 0%, Toon at 0%, Toon pummeling, Jiggs mashing every 2 frames, Jiggs breaks free on frame 24.
Jiggs at 0%, Toon at 50%, Toon pummeling, Jiggs mashing every 2 frames, Jiggs breaks free on frame 24.
Jiggs at 50%, Toon at 0%, no pummeling, no mashing, Jiggs breaks free on frame 187.
Jiggs at 50%, Toon at 50%, no pummeling, no mashing, Jiggs breaks free on frame 187.
Jiggs at 50%, Toon at 0%, Toon pummeling, no mashing, Jiggs breaks free on frame 187.
Jiggs at 50%, Toon at 50%, Toon pummeling, no mashing, Jiggs breaks free on frame 187.
Jiggs at 50%, Toon at 0%, no pummeling, Jiggs mashing every 2 frames, Jiggs breaks free on frame 33.
Jiggs at 50%, Toon at 50%, no pummeling, Jiggs mashing every 2 frames, Jiggs breaks free on frame 33.
Jiggs at 50%, Toon at 0%, Toon pummeling, Jiggs mashing every 2 frames, Jiggs breaks free on frame 30.
Jiggs at 50%, Toon at 50%, Toon pummeling, Jiggs mashing every 2 frames, Jiggs breaks free on frame 30.
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Bowser at 0%, Toon at 0%, no pummeling, no mashing, Bowser breaks free on frame 102.
Bowser at 0%, Toon at 50%, no pummeling, no mashing, Bowser breaks free on frame 102.
Bowser at 0%, Toon at 0%, Toon pummeling, no mashing, Bowser breaks free on frame 102.
Bowser at 0%, Toon at 50%, Toon pummeling, no mashing, Bowser breaks free on frame 102.
Bowser at 0%, Toon at 0%, no pummeling, Bowser mashing every 2 frames, Bowser breaks free on frame 31.
Bowser at 0%, Toon at 50%, no pummeling, Bowser mashing every 2 frames, Bowser breaks free on frame 31.
Bowser at 0%, Toon at 0%, Toon pummeling, Bowser mashing every 2 frames, Bowser breaks free on frame 35.
Bowser at 0%, Toon at 50%, Toon pummeling, Bowser mashing every 2 frames, Bowser breaks free on frame 35.
Bowser at 50%, Toon at 0%, no pummeling, no mashing, Bowser breaks free on frame 187.
Bowser at 50%, Toon at 50%, no pummeling, no mashing, Bowser breaks free on frame 187.
Bowser at 50%, Toon at 0%, Toon pummeling, no mashing, Bowser breaks free on frame 187.
Bowser at 50%, Toon at 50%, Toon pummeling, no mashing, Bowser breaks free on frame 187.
Bowser at 50%, Toon at 0%, no pummeling, Bowser mashing every 2 frames, Bowser breaks free on frame 33.
Bowser at 50%, Toon at 50%, no pummeling, Bowser mashing every 2 frames, Bowser breaks free on frame 33.
Bowser at 50%, Toon at 0%, Toon pummeling, Bowser mashing every 2 frames, Bowser breaks free on frame 29.
Bowser at 50%, Toon at 50%, Toon pummeling, Bowser mashing every 2 frames, Bowser breaks free on frame 29.