🌺 Caitanya Mahāprabhu has said,
sādhu-saṅga sādhu-saṅga sarva-śāstre kaya
lava-mātra sādhu-saṅge sarva-siddhi haya
(CC Madhya 22.54)
Here Sadhu refers to Nitai (the topmost Sadhu) and Sanga is possible by Vayulekhan. So Sadhu Sanga means Nitai Vayulekhan. Therefore, Nitai Vayulekhan can grant all perfection (sarva-siddhi) instantly (lava-matra).
🌺 Kali Yug is highly ironical. On one hand, it is almost impossible to have Sadhu-sanga as there are no real Sadhus in this degraded age. And on the other hand, there is a golden opportunity to touch, embrace, and serve the topmost Sadhu (Nitai) by the simple process of Nitai Vayulekhan. What an irony!