Hatebear companions would be more effective if they were the original companions. As it is, it will almost always be better to play the busted companion and just focus on destroying the Hatebear if your opponent actually decides to run it.
An unrestricted Necro is much more powerful than an unrestricted Bargain by virtue of being a consistent turn 1 play. The comparison to Citadel is wrong - the actual comparison is to Tinker. I hope Tinker isn't being considered for unrestriction. Those who want an unrestricted Necro haven't played Vintage recently. Or want to burn the entire format to the ground. The current version of Doomsday runs Necro and has replaced DPS as the go to ritual strategy. An unrestriced Necro would slot into most, if not all of the doomsday slots, and would create pretty abysmal gameplay in which a turn 1 Necro is supported by Daze, Force of Will, and other counterspells and discard. The deck draws back up to 7 cards, uses countermagic to untap, and either wins the game or does it again the next turn with multiple Tendrils to recoup the life. The london mulligan would provide further consistency.
Most of the cards restricted are due to interactivity reasons and unless you have a compelling reason why Flash et al. won't lead to lopsided games in which one players is a passive observer, I don't think these suggestions are really helping anything.