The karamat (charisma) of the awliya is established and proved but it shall not be taken as argument and definite proof in Shariah. Hadhrat Imam Ahmad ibn Hanbal and Hadhrat Imam Abu Hanifa (رحمہم اللہ) were the greatest Alim, Muhaddith and Faqih and wali. In this world, one can see in dreams, not in reality. Due to religious expediency much karamats did not occur from the Sahabah. However, so many miracles took place by the Prophets (عليهم السلام).
Allah knows Best!
Darul Uloom Deoband