In response to your question. I really don't think the Unbalanced I Formation has a Weakest Point.
The strength of the offense is the lateral stretch of the defense. Provided you have the correct line splits. Look at this way. If Unbalanced I had a weak point, then why does half or possibly more than half of sixman coaches in the state run some form of variation of it?
Offensive Run Plays--short sweeps, wide sweeps, dive plays, option , counter plays, trap plays, Iso's,
and reverses.
Offensive Pass Plays--Option Passing Game, Straight Drop back, Bootlegs, Screens, TBOPT.
These are all offensive plays you can run without having to using other variants. If you choose to.
You can run any of these plays to the right or left side of the formation. You can also run the ball up the middle. Provided the coaching staff is teaching the basic fundamentals of blocking and the proper mechanics of the RB'S and QB. If those things are not taught on a consistent basis, then you have no offense in any formation. Is your system technique driven? It just depends how important technique is to the coaching staff. You have to do drill work in order to have any effective offense. Kids must know their job on every play without hesitation. Hesitation causes slow play and not knowing what to do causes indecision. When technique is made a priority with the coaching staff, then it will be priority to the kids.
You can run any or all variations of this formation you like. It's your program. Ask yourself this question. Why am I running all of these various formations of the unbalanced I? Is it because that's what everyone else does? What are we accomplishing by running 5 different formations every other play? Will my kids know each of these offenses backwards and forwards? Can the kids and coaching staff make adjustments during the game on all 5 formations? Will they remember where to line up each time? Are my kids going to know where and who to block out of every single formation or will they look lost on each play on film. Are we teaching a system of fundamental football or are we just trying to trick people or catch someone off guard and get a cheap score?
One thing to factor when running Unbalanced is your kids will see multiple defensive fronts in one game. I've personally seen 10 to 12 different fronts and our kids were able to handle it. Which brings me to another point. Will your kids be able to handle adjusting to changing defensive fronts on all formations? You are going to spend a lot of time working 5 different formations against 5 defensive fronts.
If it were me and I was going to run 5 different variations for unbalanced I, I would start with the base set and then eventually branch out from that formation as the season progresses. I kind of see it this way. you can be a master at one formation and know it inside and out and be able to adjust whenever you need to or you can be a jack of all trades and master of none. Ask yourself this question when you watch film. Is the opposing team good because of the talent they have or because of the execution of the offense? I don't mean to offend anyone, I am just stating my own opinion. Like I said before, it's your program and you do what you feel is best for your kids and staff.
Get on you tube and watch Blum pull off the upset of the year against McLean. Everyone had Blum picked to get 45'd. Blum ran one unbalanced i formation. When watching the game, take note of the changing defensive fronts and moving personnel around that Mclean did during the game. Blum handled everything Mclean threw at them.
I hope this sheds some clarity.