Why don't create Zazas of Shakyamuni Buddha and hand out to everyone. Wouldn't that be even more beneficial or even Kalarupa?
Hmm... If that is the case, does it mean we should not create Zazas of Tara, Manjushri, etc? We should not create Zazas of Kalarupa too? No statue and zazas for Lama Tsongkapa too?
From what I read, there are many many Buddhas, and Buddha Shakyamuni is only one of them. Buddha Shakyamuni has praised many Buddha too such as Buddha Tara, and as such, I don't see any wrong with other Buddha statue/zazas other than Buddha Shakyamuni.
On the level of attainments, Buddha Shakyamuni, Mother Tara, Lord Manjushri, Kalarupa and Dorje Shugden are the same. In terms of their representation of the path to enlightenment, there is a slight deviation. Based on the average being in Samsara, the enlightened Beings manifests in different forms to subdue the samsaric mind. Due to this disposition, there isn't just one way out of the realm of suffering but many.
In Dorje Shugden's case, by just hearing his name, seeing his holy image and even making offerings or prayers to him, one plants the seed of enlightenment. This is based on the verse in Je Tsongkhapa's Guru Yoga:
"Your minds of wisdom realize the full extent of objects of knowledge,
Your eloquent speech is the ear-ornament of the fortunate,
Your beautiful bodies are ablaze with the glory of renown.
I prostrate to you, whom to see, to hear, and to remember is so meaningful."
Dorje Shugden is a fully enlightened being free from obscurations and defilements, He displays his enlightened activities according to our dispositions. Hence, by creating a positive connection through the actions mentioned above, you not only connect yourself to Dorje Shugden but more importantly, you have connected yourself to Buddhahood, creating the causes to realize the Buddha nature within.