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tokens: We are grateful to Hui Li for useful discussions, Myriam Benisty for making available the SPHERE image of MWC 758, and an anonymous referee for constructive suggestions that largely improved the quality of the paper. Numerical calculations were performed on the SAVIO cluster provided by the Berkeley Research Computing program, supported by the UC Berkeley Vice Chancellor for Research and the Berkeley Center for Integrative Planetary Science. Y.P. was supported by Russian Science Foundation grant 17-12-01168. This paper makes use of the following ALMA data: 2017.1.00492.S. ALMA is a partnership of the ESO (representing its member states), NSF (USA), and NINS (Japan), together with the NRC (Canada), MOST and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by the ESO, AUI/NRAO, and NAOJ. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. Y.H. is currently supported by the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. This work was supported by NAOJ ALMA Scientific Research Grant Number 2016-02A.