Ronan 5* Help please

I am new to using Ronan, i am currently doing 6.3.6 Boss (Cap Iw) and ive seen videos where he is stunt locked, does my Ronan need to be duped? And what sig level? Because i cant seem to stunt lock him and mine is unduped and he is only stunt for 2-3 seconds
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Even though both are the same approximate strength, a Rank-5 (doesn’t matter what Star Version) will have a +10% natural Power Gain rate advantage over a Rank-3 (even of a different Star version).
Each RANK higher gives an extra 5% Power Gain rate over the Rank below it.
Also, depending on how many Buffs the Opponent has on them, you could look at bringing other Synergies to help with Power Gain Rate (several different combinations of ppl), or even a newer one (Aarkus with either BWCV, OML, CapA) where Specials cost 15% less Power.
Thought it was gonna apply to all teammates, saw later that it only affects the actual Synergy Partners. (otherwise it would have been nice for Ronan's Stun-Lock though).
And if that is all you are gonna take your 5* Ronan up to anyways, then the 4*r5 might be better (unless you need the 5* specifically for Act-6 requirements). For lower content before Act-6, just need to stay alive until the infinite stun cycle, after that doesn’t really matter how long rest of fight lasts (unless there is return damage or other node aspects).
You initially claimed that we were “making this stuff up” about the difference in Power Rates. Thus I showed you it is true.