以我之见：不参与为好。

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最后回到自己这。。。。一个小老百姓你的投诉有分量么。。。。？蛇这玩意不打则以。。。。打必须一击致命。。。。你们有这本事么。。。。？如果没有干脆装傻捣浆糊。。。。

根据你的描述，B的组团投诉不会成功干掉A的。但是居于加拿大的职场文化，短期内以B为首的投诉团队也不会被无缘无故累掉。
其实最有效的办法，不是抱团投诉。而是分别就事论事投诉，就象上次没有给你合适的performance review，你去投诉一样，每个人在每次得到不合适对待时，就去投诉，时间一长，投诉的人越多，就相当于给HR及Manager多次滴眼药水，估计A即使不是自己迫于压力辞职，最后也没有好结果。
根据我的分析，我想你应该知道怎么去做。还想听我的建议吗？

还想这些事，累不累啊。我现在是只拉车，不看方向。到点下班，回家。管它上面怎么斗，关我屁事。给我啥活就干啥，上班给钱就行。

这么搞法没戏，还不如以后有机会一起教训他一回，别让他太嚣张了就是了。

Ａ和Ｂ大概是各有分工，先搞清楚ＡＢ各自的职责，只和他们交流其职责范围内的工作。你就当他们之间没有任何矛盾好了。

回复ＡＢ的建议，最好找到一个平衡点，让双方都觉得是公平的。自己提出的观点，要有足够合理的论据做支撑，否则，不发表观点和看法。

Ｂ想联合你一起干掉Ａ，你不妨从和解ＡＢ之间关系入手，去切实了解他们的想法，能力，爱好，等等。。。

这看似有些危机，但实际上也是一个很好的机会，历练自己处理人际关系的能力，首先学会两碗水端平，再学会趟浑水。如果你能摆平team lead，大概就可以找机会当ＭＧＲ了，如果你有兴趣的话，然后再学会摆平ＭＧＲ，。。。

具体情况自己具体分析吧。

Your manager do not like to involve the daily work and do not have direct knowledge how his team members perform daily. it is ridiculous behavior for such a low level manager. you team leader is stingy,not good to work with.I would suggest you start to find another internal job to make your own life easier. it should be easy as you are in the top 50 IT company.

My i know what ethnic group your manager, team leader A and team leader B belongs to?