frenzy helps with knockdowns, strip ball only works if you dont knockdown so yea, not the best synergy as jrpeart said.
You have wrestle and tackle, so you dont really get a use from juggernaut(which does have synergy with strip ball)
its a doubles on a nurgle pestigors so leap can be good. i dont think he will get a new skill but Very long legs or AG would be my choice then.
leap on a 4+ is a bit tricky though.
dodge will keep your player functioning much longer and can help you rr that dodge for the blitz for free.
sidestep with wrestle is not that strong, but can break open a corner.
diving tackle is a great skill on anything but the sacker since you can be sure you are going to be blitzed away, with wrestle not a great idea.
from here on out its personal preferance, i think dodge is better. if their ballcatcher is out in the open and they cannot protect him well enough i would put a tackle zone on the sacker and one in his way and force those 2 3+ dodges, but with a free reroll thats a lot more likely to succeed.
so dodge prob over sidestep(where it only works if he gets hit)
and leap if you find yourself unable to break the cage, but accept a 4+ to give it a spin, esp usefull with the horns blitz so 2d on the ballcarrier is good too.
negatives on the frenzy or diving tackle for reasons mentioned above
seb